问题 解答题

解方程.

x+413=730

x-7.28=10

4.5x=2.25

x÷6.8=15.

答案

(1)x+413=730,

x+413-413=730-413,

x=317;

(2)x-7.28=10,

x-7.28+7.28=10+7.28,

x=17.28;

(3)4.5x=2.25,

4.5x÷4.5=2.25÷4.5,

x=0.5;

(4)x÷6.8=15,

x÷6.8×6.8=15×6.8,

x=102.

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