解下列方程.7X-3.4X=0.72 1
解下列方程.7X-3.4X=0.721-X=15+25X-37=214....
解下列方程.7X-3.4X=0.72 1-X=15+25 X-37=214.
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(1)7X-3.4X=0.72,
(7-3.4)X=0.72,
3.6X=0.72,
3.6X÷3.6=0.72÷3.6,
X=0.2;
(2)1-X=
+
,
1-X=
,
1-X+X=
+X,
+X=1,
+X-
=1-
,
X=
;
(3)X-
=
,
X-
+
=
+
,
X=
.
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