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2/5÷x=1/4 解方程.:

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2/5÷x=4/25 解: 根据 除数=被除数÷商 得 x=2/5÷4/25 x=2/5×25/4 x=5/2 x=2.5

X÷5=1.2 X=1.2x5 X=6

x=三分之二

①x=15/28*4/5=3/7 ②x=12*1/4÷2/3=9/2

(1)x÷1.2=0.5, x÷1.2×1.2=0.5×1.2, x=0.6;(2) 3 8 +x= 4 5 , 3 8 +x- 3 8 = 4 5 - 3 8 , x= 17 40 ;(3)x- 7 12 = 1 3 ,x- 7 12 + 7 12 = 1 3 + 7 12 , x= 11 12 .

-2分之3

X=2.3除于1.15 X=2

1/10÷x=2 解x=1/10÷2 x=1/10x1/2 x=1/20

2(x-1/2)=8.8 x-1/2=8.8÷2 x-1/2=4.4 x=4.4+1/2 x=4.9 x-5÷6=5/6 x-5/6=5/6 x=5/6+5/6 x=5/3

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