问题 解答题
解比例.
15:x=0.2:44
3
20
:18%=
6.5
x

48-(1.08+0.12)x=45.6.
答案

(1)15:x=0.2:44

0.2x=15×44

0.2x=660

0.2x÷0.2=660÷0.2

x=3300;

(2)

3
20
:18%=
6.5
x

3
20
x=18%×6.5

3
20
x=1.17

3
20
3
20
=1.17÷
3
20

x=7.8;

(3)48-(1.08+0.12)x=45.6

48-1.2x=45.6

48-1.2x+1.2x=45.6+1.2x

1.2x+45.6=48

1.2x+45.6-45.6=48-45.6

1.2x=2.4

1.2x÷1.2=2.4÷1.2

x=2.

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