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.