问题 解答题
求未知数x.
(1)x-
1
3
=1
(2)1.2x-x=0.72.
答案

(1)x-

1
3
=1,

x-

1
3
+
1
3
=1+
1
3

x=1

1
3

(2)1.2x-x=0.72,

0.2x=0.72,

0.2x÷0.2=0.72÷0.2,

x=3.6.

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