问题
解答题
解方程 X-0.42=6.9 5X=1.3 X÷0.08=2.5 X+
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答案
(1)X-0.42=6.9,
X-0.42+0.42=6.9+0.42,
X=7.32;
(2)5X=1.3,
5X÷5=1.3÷5,
X=0.26;
(3)X÷0.08=2.5,
X÷0.08×0.08=2.5×0.08,
X=0.2;
(4)X+
=3 8
,5 6
X+
-3 8
=3 8
-5 6
,3 8
X=
.11 24