题目内容
解比例或方程.
0.8x:1.2=3:0.9
5×70%+0.4x=9.1
x-
x=
:
=x:
.
0.8x:1.2=3:0.9
5×70%+0.4x=9.1
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(1)0.8x:1.2=3:0.9,
0.8x×0.9=1.2×3,
0.72x=3.6,
0.72x÷0.72=3.6÷0.72,
x=5;
(2)5×70%+0.4x=9.1,
3.5+0.4x=9.1,
3.5+0.4x-3.5=9.1-3.5,
0.4x=5.6,
0.4x÷0.4=5.6÷0.4,
x=14;
(3)
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x=2;
(4)
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x=
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x=
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