1楼:凌月霜丶
3/8+(3/4--1/8)=
=3/8+1/8+3/4
=1/4+3/4
=112--11/15×8/45×15/11==11-11/15*15/11*8/45
=11-8/45
=10又37/45
3/11÷4/7+8/11×7/4
=3/11*7/4+8/11*7/4
=7/4*(3/11+8/11)
=7/4*1
=7/4
2楼:匿名用户
第一题3/4通分等于6/8
(1/15+1/21)×105 45÷5/7÷7/8 8/13÷7-1/7×6/13 1/5×5/8-1/5÷8/3 3/5÷5/8+2/5÷5/8简便运算
3楼:叫啥知不道
(1/15+1/21)×105
=(1/15)
*(15*7)+(1/21)*(21*5)=7+5
=1245÷5/7÷7/8
=5*9*(7/5)*(8/7)
=9*8
=728/13÷7-1/7×6/13
=8/13*(1/7)-6/13*(1/7)=(8/13-6/13)*(1/7)
=2/13*1/7
=2/91
1/5×5/8-1/5÷8/3
=1/5*5/8-1/5*3/8
=1/5*(5/8-3/8)
=1/5*1/4
=1/20
3/5÷5/8+2/5÷5/8
=(3/5+2/5)*(8/5)
=1*8/5
=8/5
x-1/2x=5/8
1/2x=5/8
x=5/8*2
x=5/4
4/5x÷2=7/16
4/5x=7/16*2
x=7/8*5/4
x=35/32
1/4x+1/3x=5/18
7/12x=5/18
x=5/18*12/7
x=10/21
1/8x÷3/10=5/18
1/8x=5/18*3/10
x=1/12*8
x=2/3
4/5x-3/4x=25
(16/20-15/20)*x=25
x=25/(1/20)
x=500
4楼:匿名用户
(1/15+1/21)×105=7+5=12
45÷5/7÷7/8 =45*7/5*8/7 =45*8/5=72
8/13÷7-1/7×6/13 =(8-6)/(13*7)=2/91
1/5×5/8-1/5÷8/3=5/40-3/40=2/40=1/20
3/5÷5/8+2/5÷5/8=(3/5+2/5)÷5/8 =8/5
x-1/2x=5/8 , x=5/4
4/5x÷2=7/16 , 2/5 x= 7/16, x=35/32
1/4x+1/3x=5/18 , 7/12 x = 5/18, x=10/21
1/8x÷3/10=5/18 , 1/8 x =5/18*3/10, x=2/3
4/5x-3/4x=25, (16-15)/20 x =25, x=500
能用简便方法计算的用简便方法计算:1,201x45 2,24乘(3/8+1/6-1/12)
5楼:匿名用户
201x45
=(200+1)x45
=200x45+1x45
=9000+45
=9045
24乘(3/8+1/6-1/12)
=24x3/8+24x1/6-24x1/12=9+4-2=11
6楼:匿名用户
201×45
=(200+1)×45=200×45+1×45=9000+45=9045;24×(3/8+1/6-1/12)=24×3/8+24×1/6-24×1/12
=9+4-2=11
7楼:却妮本小雯
原式=4/15x45+5/9x45-17/45x45=4x3+5x5-17x1
=12+25-17
=37-17
=20供参考。
简便计算: 1. 3.625÷5/32+6又2/5×3/8+6.4 2. 45÷5/8+1.6+4.4×1又3/5 3. 8/9×【3/4-(7/16-0.25)】
8楼:匿名用户
1. 3.625÷5/32+6又2/5×3/8+6.4=3.625×32/5+
6.4×3/8+6.4×1
=3.625×6.4+6.4×0.375+6.4×1=6.4×(3.625+0.375+1)
=6.4×5
=322. 45÷5/8+1.6+4.
4×1又3/5=45×8/5+1.6×1+4.4×1.
6=45×1.6+1.6×1+4.
4×1.6=1.6×(45+1+4.
4)=1.6×50.4
=1.6×(50+0.4)
=1.6×50+1.6×0.4
=80+0.64
=80.64
3. 8/9×【3/4-(7/16-0.25)】=8/9×【3/4-(7/16-1/4)】=8/9×【3/4-7/16+1/4】
=8/9×【3/4+1/4-7/16】
=8/9×【1-7/16】
=8/9×9/16
=1/2
4. 6.3×29又4/5+2.98×37=6.3×29.8+2.98×37
=63×2.98+2.98×37
=2.98×(63+37)
=2.98×100
=298
5. 3.6×31又2/5+314×0.
63+3.14=3.6×31.
4+314×0.63+3.14=36×3.
14+3.14×63+3.14×1=3.
14×(36+63+1)
=3.14×100
=314
6. 72×61又3/10+73.8*2又4/5=72×61.3+73.8×2.8
=72×61.3+(72×1.025×2.8)=72×61.3+72×(1.025×2.8)=72×61.3+72×2.87
=72×(61.3+2.87)
=72×64.17
=4620.24
7. 1/5+51/5+501/5+5001/5+50001/5=1/5+10又1/5+100又1/5+1000又1/5+10000又1/5
=(10+100+1000+10000)+(1/5+1/5+1/5+1/5+1/5)
=11110+1
=11111
9楼:妙酒
1. 3.625÷5/32+6又2/5×3/8+6.4=3又5/8x32/5+32/5x3/8+6.4=(3又5/8+3/8)x6.4+6.4
=4x6.4+6.4
=(4+1)x6.4
=5x6.4
=322. 45÷5/8+1.6+4.4×1又3/5=45x8/5+8/5+4.4x8/5
=(45+1+4.4)x8/5
=(50+0.4)x8/5
=50x8/5+0.4x8/5
=80+0.64
=80.64
3. 8/9×【3/4-(7/16-0.25)】=8/9x(3/4-7/16+1/4)
=8/9x(1-7/16)
=8/9x9/16
=1/2
4. 6.3×29又4/5+2.98×37=6.3x29.8+29.8x0.1x37=29.8x(6.3+3.7)
=29.8x10
=298
5. 3.6×31又2/5+314×0.
63+3.14=3.6x31.
4+31.4x10x0.63+31.
4x0.1=31.4x(3.
6+6.3+0.1)
=31.4x10
=314
6. 72×61又3/10+73.8*2又4/5=72x61.3+73.8x2.8
=4413.6+206.64
=4620.24
7. 1/5+51/5+501/5+5001/5+50001/5=1/5+10又1/5+100又1/5+1000又1/5+10000又1/5
=10000+1000+100+10+1/5x5=11111
10楼:围观者
1.原式=3.625*(32/5)+(32/5)*0.375+32/5=(32/5)*(3.625+0.375+1)=(32/5)*5=32
2.原式=45*(8/5)+8/5+4.4*(8/5)=(8/5)*(45+1+4.4)=80.64
3.原式=8/9 *(3/4-7/16+1/4)=8/9 * 9/16=1/2
4.原式=6.3*29.8+2.98*37=2.98*(63+37)=2.98*100=298
5.原式=3.6*31.4+314*0.63+3.14=3.14*(36+63+1)=3.14*100=314
6.题没抄错吧
7.原式=1/5+10+1/5+100+1/5+1000+1/5+10000+1/5=11111
小学四年级的数学题(应用题 笔算等)
11楼:樱雪妃媗
32.8+19= 0.51÷17= 240÷30= 1000×0.8=
3.06+0.2= 0.67+1.24= 8×125= 7-6.28=
8.2-0.01= 99×23= 50×4= 5÷1000=
0.42+9.5= 65×25×4= 0.08÷100= 10×0.5=
1.82-0.63= 4.5+1.5= 1-0.63= 231-99=
二、填空(每空1分,共15分)
1.一个数,亿位上是6,百万位上是4,十万位上是5,千位上是8,其余各位上都是0,这个数写作( ),读作( ),最高位的计数单位是( ).
2.三百二十三亿六千八百七十万,写作( ),改写成用“亿”作单位的数约是( ).
3.25米60毫米=( )毫米
4.3.45平方米=( )平方米( )平方分米
5.150分=( )时( )分
6.15吨60千克=( )千克
7.自然数和0都是( )数.
最小的数是( ).
三、判断(正确的在括号里划“√”,错误的在括号里划“×”)(每题1分,共10分)
1.小数加法的意义与整数加法的意义完全相同. ( )
2.不相交的两条直线叫做平行线. ( )
3.在有余数的除法里,除数一定比余数大. ( )
4.0.47扩大10倍等于470缩小100倍. ( )
5.角的大小与边的长短有关. ( )
6.小数一定比整数小. ( )
7.最大的四位数比最小的五位数多1. ( )
8.有二个角是锐角的三角形叫锐角三角形. ( )
9.57×101的简便算法是57×100+57=5757. ( )
10.a×b的积一定大于a. ( )
四、计算题(共33分)
1.计算下面各题并验算.(每题2分,共4分)
①802×11 ②329÷48
2.求未知数x.(每题2分,共8分)
①x×123=1845 ②x+0.05=3.528
③x-3.6=7.89 ④8064÷x=144
3.计算下面各题,能用简便算法的用简便算法(每题3分,共21分)
①3871-(1080-740)×7 ②5175÷207+102×9
③0.9+1.08+0.92+0.1 ④13.59-6.91-0.09
⑤983×(3.8+2.2)+0.237×1000
⑥0.8×(35+65)×5÷100
⑦30-[17.8+(6.2+38÷10)]
五、列式计算(每题3分,共12分)
1.10减去5.6与1.4的和,所得的差去除246,商是多少?
2.6.2减去2.4与1.3的和,所得的差乘以100,积是多少?
3.21乘以32与88的积,所得的积再减去9136,差是多少?
4.357除以7的商,加上1000与0.875的积,和是多少?
六、应用题(每题5分,共20分)
1、某小学三年级和四年级要给620棵树浇水,三年级每天浇40棵,浇了8天;剩下的由四年级来浇,5天浇完,平均每天浇多少棵?
2.3台织布机4小时织布336米,照这样计算,1台织布机8小时织布多少米?
3.甲乙两地相距560千米,一辆汽车从甲地开往乙地,每小时行48千米,另一辆汽车从乙地开往甲地,每小时行32千米.两车从两地相对开出5小时后,两车相距多少千米?
4.一段公路原计划20天修完.实际每天比原计划多修45米,提前5天完成任务.原计划每天修路多少米?
参***
一、(略)
二、1.604508000,六亿零四百五十万八千,亿.
2.32368700000,324亿.
3.25060
4.3,45
5.2,30
6.15060
7.整三、1.√ 2.× 3.√ 4.√ 5.× 6.× 7.× 8.× 9.√ 10.×
四、1.计算下面各题并验算
①8822 ②6……41
2.求未知数x
①x=15 ②x=3.479 ③x=11.49 ④x=56
3.计算下面各题,能用简便算法的用简便算法
①1491 ②943 ③3 ④6.59 ⑤6135 ⑥4 ⑦2.2
五、1.82 2.250 3.50000 4.926
六、1.60棵 2.224米 3.160千米 4.45×(20-5)÷5=135(米)
4(3 3)X36 ,3/7X1/4÷3/4 (3/8+2/3)X36 7/5X2/3+14/15÷1/9 13/12÷(3/4+1/3) 给答案,我看对不对,如果有过程的
1楼 匿名用户 3 7x1 4 3 4 3 7x1 4x4 3 1 7 3 8 2 3 x36 3 8x36 2 3x36 37 5 7 5x2 3 14 15 1 9 14 15 14 15x9 14 15 1 9 9又1 3 13 12 3 4 1 3 13 12x12 13 1 简算 3 4 ...