1楼:妙酒
4/9×2/7+2/7
=2/7x(4/9+1)
=2/7x13/9
=26/63
1/6-3/8×1/6
=1/6x(1-3/8)
=1/6x5/8
=5/48
1/9-6/7×1/9
=1/9x(1-6/7)
=1/9x1/7
=1/63
2楼:比蜜甜甜
4/9×2/7+2/7
=2/7x(1+4/9)
=26/63
1/6-3/8×1/6
=1/6(1-3/8)
=5/48
1/9-6/7×1/9
=1/9(1-6/7)
=1/63
(数学)3/4+1/3-5/6= 3/8+1/2-1/4= 1/6-1/9+7/12= 1-2/5-2/7= 3/4+(4/5-1/4)= 3/5-(1/10+3/8)=
3楼:甜甜の★微笑
3/4+1/3-5/6=1/4 3/8+1/2-1/4= 5/8 1/6-1/9+7/12=23/36 1-2/5-2/7=11/35 3/4+(4/5-1/4)= 13/10 3/5-(1/10+3/8)=1/8 2/3-(5/6-5/8)= 11/24 2/3-4/7+5/6=13/14
用简便的方法做
7/9+5/7+5/9=34/21 12/25-1/8-1/24=47/150 1-2/5-7/20=1/4
5/8+4/7+9/8-14/1=负数 5/9-(1/3+1/8)=7/72
从4/5里减去1/5与2/7的和,差是多少?
4/5-(1/5+2/7)=11/35
2/5加上7/10,再减去11/20,得多少?
2/5+7/10-11/20=11/20
5/6加上5/8与1/4的差,和是多少?
5/6+(5/8-1/4)=29/24
4楼:懦弱的龙骑士
3/4+1/3-5/6= 9/12+4/12-10/12=1/4
3/8+1/2-1/4= 3/8+2/4-1/4=3/8+1/4=3/8+2/8=5/8
1/6-1/9+7/12= 3/4-1/9=23/36
1-2/5-2/7=1-(14/35+10/35)=11/35
3/4+(4/5-1/4)= 3/4+(16/20-5/20)=15/20+11/20=26/20=13/10
3/5-(1/10+3/8)=6/10--1/10-3/8==1/2-3/8=1/8
2/3-(5/6-5/8)=16/24-(20/24-15/24)=11/24
2/3-4/7+5/6=9/6-4/7=21/14-8/14=13/14
用简便的方法做
7/9+5/7+5/9=(7/9+5/9)+5/7=12/9+5/7=4/3+5/7=28/21+15/21=43/21
12/25-1/8-1/24=12/25-(1/8+1/24)=12/25-(3/24+1/24)=12/25-1/6= 72/150-25/150=47/150
1-2/5-7/20= 1-(8/20+7/20)=1/4
[ 5/8+4/7+9/8-14/1=7/4+4/7-14=49/28+16/28-14=65/28-14= -83/7 ]
5/9-(1/3+1/8)=5/9-1/3-1/8=5/9-3/9-1/8=2/9-1/8=7/72
从4/5里减去1/5与2/7的和,差是多少?
4/5-(1/5+2/7)=4/5-1/5-2/7=3/5-2/7=11/35
2/5加上7/10,再减去11/20,得多少?
(2/5+7/10)-11/20=(4/10+7/10)-11/20=11/10-11/20=22/20-11/20=11/20
5/6加上5/8与1/4的差,和是多少?
5/6+(5/8-1/4)=5/6+(5/8-2/8)=5/6+3/8=20/24+9/24=29/24
5楼:匿名用户
热,通分不行吗!!!!
要简便算法,过程 1:8/9×(9+3/4)-2/3 2:7/8÷2/3+7/8×1/2 3:4-2/5÷8/15-1/4
6楼:
1:8/9×(
9+3/4)-2/3=8/9×9+8/9×3/4-2/3=8+2/3-2/3=8 2:7/8÷2/3+7/8×1/2=7/8×3/2+7/8×1/2=7/8×(3/2+1/2)=7/8×2=7/4 3:4-2/5÷8/15-1/4=4-2/5×15/8-1/4=4-3/4-1/4=4-(3/4+1/4)=4-1=3 4:
7/8+2/3÷4/5+1/6=7/8+2/3×5/4+1/6=7/8+5/6+1/6=7/8+1=15/8 5: 6-5/12×9/10-13/8 =6-3/8-13/8=6-(3/8+13/8)=6-2=4 6: 4/5+5/8÷1/4+1/2=4/5+5/8×4+1/2=4/5+5/2+1/2=4/5+3=19/5 7:
2-8/9×3/4-1/3=2-2/3-1/3=2-(2/3+1/3)=2-1=1 10: 4/9+2/7+5/18÷1/2=4/9+2/7+5/18×2=4/9+2/7+5/9=4/9+5/9+2/7=1+2/7=9/7 11:4-8/15÷2/3-1/5=4-8/15×3/2-1/5=4-4/5-1/5=4-(4/5+1/5)=4-1=3 口算的,你回去检验下吧
7楼:匿名用户
8/9×(9+3/4)-2/32=8/9*9+8/9*3/4-1/16=8+(2/3-1/16)=8又29/48
8楼:匿名用户
7/8+2/3*5/4+1/6=7/8+5/6+1/6=15/8
9楼:含黙兮攸语
我x,这个还要简便方法。我砸觉得直接算就是最简便的、。、、
6/5-4/2= 3/2-2/1= 4/1+3/2= 5/3-3/1= 8/4-6/1= 3/5-4/3= 6/2+3/1= 9/5-2/1= 7/2+3/1= 5/2-6/2= 4/2+2/1= 8
10楼:匿名用户
6/5-4/2=12/4=3/1
3/2-2/1= 6/4-6/3=6/1
4/1+3/2= 12/3+12/8=12/115/3-3/1=15/9-15/5=15/48/4-6/1= 24/12-24/4=24/8=3/13/5-4/3=12/20-12/9=12/116/2+3/1=3/1+3/1=3/2
9/5-2/1=18/10-18/9=18/17/2+3/1=21/6+21/7=21/135/2-6/2= 30/12-30/10=30/2=15/14/2+2/1=2/1+2/1=1
1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9+1/9*10用简便方法怎么算?
11楼:枫叶
=(1+20)×10
=21×10
=210
你好,本题已解答,如果满意,请点右上角“采纳答案”。
12楼:匿名用户
拆分每个分数。记住等式:
1/(x(x+1))=1/x-1/(x+1)
所以,原等式就可以简化为1/1-1/10=0.9
13楼:柳树湾笑声
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+... +(1/8-1/9)+(1/9-1/10)
=1-1/10=9/10
(5/6-3/4)÷(2/3+4/9) (1-1/6×2/5)÷7/9
14楼:新野旁观者
(5/6-3/4)÷(2/3+4/9)
=1/12÷10/9
=3/40
(1-1/6×2/5)÷7/9
=(1-1/15)÷7/9
=14/15÷7/9
=6/5
(5/9+1/13)×9+4/13
=5/9×9+1/13×9+4/13
=5+(9/13+4/13)
=5+1
=65/4-(3/4-1/8)-3/8
=(5/4-3/4)-(3/8-1/8)
=1/2-1/4
=1/4
15楼:kz菜鸟无敌
(5/6-3/4)÷(2/3+4/9)
= (10/12-9/12)÷(6/9+4/9)=1/12÷10/9
=1/12 x 9/10
=3/40
~~~~~~ (1-1/6×2/5)÷7/9=(1-1/15) ÷ 7/9
=14/15 x 9/7
=6/5
~~~~~
(5/9+1/13)×9+4/13
=5/9 x 9 + 1/13 x 9 +4/13=5 + 9/13 + 4/13
=5 + 1
=6~~~~~
5/4-(3/4-1/8)-3/8
=5/4 - ( 6/8 - 1/8 ) - 3/8=5/4 - 5/8 -3/8
=5/4 - 1
=1/4
写个程序,求1-1/2+1/3-1/4+1/5-1/6+1/7-1/8+1/9-1/10...
16楼:栖霞夕阳
注意:1/2是0,1.0/2结果才是0.5。同样-1/4,1/5都是0,希望可以帮到你。
17楼:牙刷的悲伤
因为你设置的1/2等用的都是整形变量,当然结果等于0,你把后面的变量改成float就行了。
计算脱式 (5/6-1/4*2/3)÷1/6 (3/8-1/4)÷(8/9*3/4) 18/35÷0.6*2/3 7/8*【1÷(7/10-7/20)】 下面
18楼:匿名用户
(5/6-1/4*2/3)
÷1/6
=(5/6-1/6)
=5/6×6/1-1/6×6/1
=5-1
=4(3/8-1/4)÷(8/9*3/4)=(3/8-1/4)÷2/3
=3/8×3/2-1/4×3/2
=9/16-3/8
=9/16-6/16
=3/16
或=(3/8-1/4)÷2/3
=1/8×3/2
=3/16
18/35÷0.6*2/3
=18/35÷3/5×2/3
=18/35×5/2
=9/7
7/8*【1÷(7/10-7/20)】
=7/8×[1÷7/20]
=7/8×[1×20/7]
=7/8×20/7
=5/2
4.67-(2.98+0.67)
=4.67-2.98-0.67
=4-2.98
=4-(3-0.02)
=4-3+0.02
=1.02
7.85*99+7.85
=7.85(99+1)
=7.85×100
=785
(51+34/39)*2/17
=51*2/17+34/39*2/17
=3*2+4/39
=6+4/39
=6又4/39
7.5*0.4*25*0.8
=25*0.3*0.4*25*0.2*4
=25*4*25*0.4*0.3*0.2
=100*10*0.06
=60102*7.8
=(100+2)*7.8
=780+15.6
=795.6
14.28÷3.5÷2
=14.28÷(3.5*2)
=14.28÷7
=2.04
2/3*1/15+14/15*2/3
=2/3(1/15+14/15)
=2/3×1
=2/3
97*97/98
=97×(1-1/98)
=97-97/98
=96又1/98
19楼:我不是他舅
(5/6-1/4*2/3)÷1/6
=(5/6-1/6)×
6=4/6×6
=4(3/8-1/4)÷(8/9*3/4)=1/8÷2/3
=1/8×3/2
=3/16
18/35÷0.6*2/3
=18/35×5/3×2/3
=6/7×2/3
=4/7
7/8*【1÷(7/10-7/20)】
=7/8×1÷7/20
=7/8×20/7
=5/2
4.67-(2.98+0.67)
=4.67-0.67-2.98
=4-2.98
=1.02
7.85*99+7.85
=7.85×(99+1)
=7.85×100
=785
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