题目内容
解方程.
(1)12x+7×0.3=20.1 (2)
x+
x=
(3)X:42=
:10.
(1)12x+7×0.3=20.1 (2)
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(1)12x+7×0.3=20.1,
12x+2.1=20.1,
12x+2.1-2.1=20.1-2.1,
12x÷12=18÷12,
x=1.5;
(2)
x+
x=
,
x=
,
x×
=
×
,
x=
;
(3)x:42=
:10,
10x=42×
,
10x÷10=30÷10,
x=3.
12x+2.1=20.1,
12x+2.1-2.1=20.1-2.1,
12x÷12=18÷12,
x=1.5;
(2)
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x=
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(3)x:42=
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10x=42×
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10x÷10=30÷10,
x=3.
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