问题 解答题
求未知数x.
5x-0.7×3=6.6
1
5
:x=5
x÷(1-24%)=1.15.
答案

(1)5x-0.7×3=6.6,

5x-2.1=6.6,

5x-2.1+2.1=6.6+2.1,

5x=8.7,

5x÷5=8.7÷5,

x=1.74;

(2)

1
5
:x=5,

5x=

1
5

5x÷5=

1
5
÷5,

x=

1
25

(3)x÷(1-24%)=1.15,

x÷76%=1.15,

x÷76%×76%=1.15×76%,

x=0.874.

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