解方程: x-0.4x-1.9
解方程:x-0.4x-1.9=1.723:34=x1214+34x=12....
解方程: x-0.4x-1.9=1.7 23:34=x12 14+34x=12.
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2014-10-08
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(1)x-0.4x-1.9=1.7,
0.6x-1.9=1.7,
0.6x-1.9+1.9=1.7+1.9,
0.6x=3.6,
0.6x÷0.6=3.6÷0.6,
x=6;
(2)
:
=
,
x=
×12,
x=8,
x÷
=8÷
,
x=
;
(3)
+
x=
,
+
x-
=
-
,
x=
,
x÷
=
÷
,
x=
.
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