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】 (3/4-2/3)÷1/5 4/5×7/8+7/8÷5 (1-8/15×3/4)÷3/5 (3/8+2/17)×8+1/17
2楼:新野旁观者
(3/4-2/3)÷1/5
=1/12ch35
=5/12
4/5×
7/8+7/8÷5
=(4/5+1/50×7/8
=1×7/8
=7/8
(1-8/15×3/4)÷3/5
=(1-2/5)×5/3
=3/5×5/3
=1(3/8+2/17)×8+1/17
=3/8×8+(16/17+1/17)
=3+1=4
计算下面各题,注意使用简便方法 (3/4-2/3)÷1/5 (3/8+7/12)×8+1/
3楼:匿名用户
(3/4-2/3)÷1/5
=(9/12-8/12)x5
=1/12x5
=5/12
(3/8-7/12)x8+1/17
=3/8x8-7/12x8+1/17
=3-14/3+1/17
=5/3+1/17
=88/51
4/5x7/8+7/8÷5
=4/5x7/8+7/8x1/5
=(4/5+1/5)x7/8
=1x7/8
=7/8
(1-8/15x3/4)÷3/5
=(1一2/5)x5/3
=3/5x5/3=1
简便计算(1/2-13)x3/4÷1/4 1/2x3/8+4/5x3/8+7/10÷8/3 4x60%+19/25x40%+19/25x60%
4楼:叫啥知不道
(1/2-1/3)x3/4÷1/4
=1/6*3/4*4
=1/2
1/2x3/8+4/5x3/8+7/10÷8/3=(1/2+4/5+7/10)*3/8
=2*3/8
=3/4
4x60%+19/25x40%+19/25x60%=4*60%+19/25*(40%+60%)=4*60%+19/25
=240%+78/100
=318%
=3.18
1/7÷3/14-5/8 1/3+3/9/10 1/2-4/25÷2/5 1-8/9÷5/6*3/16 2/3÷(1-2/3 (3/4-3/4*5/6)÷3/2 10
5楼:陈飞宏
2.165888 正确
6248.55正确
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、。、、
12×3/8÷3/4 (1/4+2/9)×72 7/15+8/15×15 3-2/3÷4/5-1/6 (1/3+1/2)÷(1-3/8)
10楼:遇水涅磐
12×3/8÷3/4=6
(1/4+2/9)×72=34
7/15+8/15×15=127/15
3-2/3÷4/5-1/6=2
(1/3+1/2)÷(1-3/8)=4/3
写出过程 16×8/7+4/3 (8/7-4/1)÷4/1 9/8÷3/1+9/4÷3/2 6/5×5/3÷3/2
11楼:雪中送炭新野
一个数乘分数,积一定小于这个分数。( × )“红花的多数是黄花的6分之1”是把黄花的朵数看作单位“1”( √ )
16×8分之7+4分之3
=14+3/4
=14又3/4
(8分之7-4分之1)÷4分之1
=7/8×4-1/4×4
=7/2-1
=2.5
9分之8÷3分之1+9分之4÷3分之2
=8/9×3+4/9×3/2
=8/3+2/3
=10/3
6分之5×5分之3÷3分之2
=5/6×3/5×3/2
=3/4
2/9+1/4÷2/5+3/8 2/3+(4/7-1/2)×1/12 2/3+3/4x=1/6 1/2x÷1/5=3/5 5x-3/5=16/15 以上这几题怎么做??
12楼:匿名用户
2/9+1/4÷2/5+3/8
=2/9+1/4×
5/2+3/8
=2/9+5/8+3/8
=2/9+(5/8+3/8)
=2/9+1
=1·2/9
=11/9
2/3+(4/7-1/2)×1/12
=2/3+(4/7-1/2)×1/12
=2/3+4/7×1/12-1/2×1/12=2/3+1/21-1/24
=14/21+1/21-1/24
=15/21-1/24
=5/7-1/24
=120/168-7/168
=113/168
2/3+3/4x=1/6
3/4x=1/6-2/3
3/4x=1/6-4/6
3/4x=-1/2
x=-1/2×4/3
x=-2/3
1/2x÷1/5=3/5
1/2x=3/5×5
1/2x=3
x=3×2
x=65x-3/5=16/15
5x=16/15+3/5
5x=16/15+9/15
5x=25/15
5x=5/3
x=5/3×1/5
x=1/3