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(2003•龙湖区)求未知数X.(1)0.2X+0.4×3=9.4(2)12:15=0.25:X.
题目详情
(2003•龙湖区)求未知数X.
(1)0.2X+0.4×3=9.4
(2)
:
=0.25:X.
(1)0.2X+0.4×3=9.4
(2)
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▼优质解答
答案和解析
(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)
:
=0.25:X,
X=
×0.25,
X=0.05,
X÷
=0.05÷
,
X=0.1.
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)
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2 |
1 |
5 |
1 |
2 |
1 |
5 |
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X=0.1.
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