问题
解答题
解比例 (1)
(2)
(3)
(4)
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答案
(1)
=12.5 2.5
,x 8
2.5x=12.5×8,
2.5x÷2.5=100÷2.5,
x=40;
(2)
:3 4
=x:9 10
,3 5
x=9 10
×3 4
,3 5
x÷9 10
=9 10
÷9 20
,9 10
x=
;1 2
(3)
=22.4 x
,2 3
2x=22.4×3,
2x÷2=67.2÷2,
x=33.6;
(4)
=6 x
,10 7
10x=6×7,
10x÷10=42÷10,
x=4.2.