问题 解答题
求未知数X.
(1)0.2X+0.4×3=9.4
(2)
1
2
1
5
=0.25:X.
答案

(1)0.2X+0.4×3=9.4,

0.2X+1.2=9.4,

0.2X+1.2-1.2=9.4-1.2,

0.2X=8.2,

0.2X÷0.2=8.2÷0.2,

X=41;

(2)

1
2
1
5
=0.25:X,

1
2
X=
1
5
×0.25,

1
2
X=0.05,

1
2
1
2
=0.05÷
1
2

X=0.1.

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