简便运算 1. 5/7×1/4+1/4×2/7 2.100×(1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9
简便运算 1. 5/7×1/4+1/4×2/7 2.100×(1/5+3/20+4/25) 3.1/5×50+50*4/5 4.2/9*8+2/9
您好:
1. 5/7×1/4+1/4×2/7
=1/4x(5/7+2/7)
=1/4x1
=1/4
2.100×(1/5+3/20+4/25)
=100x1/5+100x3/20+100x4/25
=20+15+16
=51
3.1/5×50+50*4/5
=50x(1/5+4/5)
=50x1
=50
4.2/9*8+2/9
=2/9x(8+1)
=2/9x9
=2
不明白,可以追问
如有帮助,记得采纳,谢谢
祝学习进步!
6/7×1/8+1/7×1/8+1/7=? 1/2×2/3×1/3+1/2=? 4/5×5/9+4/9×4/5=? 要简便运算
6/7×1/8+1/7×1/8+1/7
=1/7×6/8+1/7×1/8+1/7
=1/7×(6/8+1/8+1)
=1/7×15/8
=15/56
1/2×2/3+1/3×1/2
=1/2×(2/3+1/3)
=1/2
4/5×5/9+4/9×4/5
=4/5×(5/9+4/9)
=4/5×1
=4/5
1/5+2/9÷5/9 4/15×5/6×5/12 4÷2/3÷9/20 12×(1/4+1/6-1/3) 用简便。
解:1/5+2/9/5/9=2/5+1/5=3/5
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①(-1又1/4)×(-3又4/5)②(-2)×5/4×(-9/10)×(-2/3)简便运算
① = 4分之5×5分之19 = 4分之19
② = -2×4分之5×10分之9×3分之2
= -(4×10×3)分之(2×5×9×2)
= -120分之180
= -2分之3
(1/3-1/4)÷1/8+5/6 8-5/9-9/1*4 (1/2-1/3+1/6)*24 4/9÷{4/5-(1/5+1/3)} 简便运算
(1/3-1/4)÷1/8+5/6
=(1/3-1/4)×8+5/6
=1/3×8-1/4×8+5/6
=8/3-2+5/6
=2/3+5/6
=3/2
8-5/9-9/1*4
=8-5/9-4/9
=8-(5/9+4/9)
=8-1
=7
(1/2-1/3+1/6)*24
=1/2×24-1/3×24+1/6×24
=12-8+4
=8
4/9÷{4/5-(1/5+1/3)}
=4/9÷{4/5-1/5-1/3}
=4/9÷{3/5-1/3}
=4/9÷4/15
=4/9×15/4
=5/3
简便运算:(7/9+3/4-1/6-7/18)1/36, 2/5*5/9/(2/5-4/15)
(7/9+3/4-1/6-7/18)÷1/36
=(7/9+3/4-1/6-7/18)×36
=7/9×36+3/4×36-1/6×36-7/18×36
=28+27-6-14
=25
2/5*5/9/(2/5-4/15)
=2/9/(2/15)
=2/9×15/2
=5/3
1/4+5又2/7×1/4+3又5/7÷4简便运算。
1/4*(37/7+26/7)/4
= 1/4*9*1/4
=9/16
简便运算,4/15/(1又4/9-2/3*5/6)+1/5
一看就是小学生嘛 先你的写法很不规范嘛 我理解没有错的话是这样的:第一步,括号里先算的(13/9-5/9)=8/9没有为题吧 第二步.除变乘得(4/15)*(9/8)=3/10 第三步,3/10-1/5=1/10 你写的时候别像我这样啊 我是帮你理清思路的.
简便计算 1/5÷(1-1/3×1/2) 9/10×【7/8÷(4/5+1/4)】 (1/4-1/4×1/2)÷1/4 5/6+9/
简便计算
1/5÷(1-1/3×1/2)
=1/5÷(1-1/6)
=1/5*6/5
=6/25
直接计算
六年级分数简便运算,1/2÷4/5÷(2/9×3/8) (5/6-3/4)÷5/12÷9/5 3/7÷[5/7-(3/7+1/5)]
1/2÷4/5÷(2/9×3/8)
=1/2 x 5/4 x9/2 x 8/3
=5/8 x 8/3 x 9/2
=5/3 x 9/2
=15/2