解方程.12X-3×5=40 &nb...
解方程.12X-3×5=4034-15+X=782X-56=16....
解方程.12X-3×5=40 34-15+X=782X-56=16.
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萌珞歌87
2014-10-17
·
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(1)12X-3×5=40,
12X-15=40,
12X-15+15=40+15,
12X=55,
12X÷12=55÷12,
X=
;
(2)
-
+X=
,
-
+X-(
-
)=
-(
-
),
X=
-
,
X=
;
(3)2X-
=
,
2X-
+
=
+
,
2X=1,
2X÷2=1÷2,
X=
.
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