问题 解答题

(1)x÷36=0.4    

(2)8x-9.1=22.9

(3)36+2x=78.6   

(4)4×0.9+3x=46.2.

答案

(1)X÷36=0.4 

X÷36×36=0.4×36,

X=14.4;

(2)8X-9.1=22.9,

8X-9.1+9.1=22.9+9.1,

8X=32,

8X÷8=32÷8,

X=4;

(3)36+2X=78.6,

36+2X-36=78.6-36,

2X=42.6,

2X÷2=42.6÷2,

X=21.3;

(4)4×0.9+3X=46.2,

3.6+3X=46.2,

3.6+3X-3.6=46.2-3.6,

3X=42.6,

3X÷3=42.6÷3,

X=14.2.

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