问题
解答题
解比例. (1)
(2)2.7:x=54:18 (3)
(4)
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答案
(1)
=x 8
,4.5 0.9
0.9x=4.5×0.8,
x=
,4.5×0.8 0.9
x=4;
(2)2.7:x=54:18,
54x=2.7×18,
x=
,2.7×18 54
x=0.9;
(3)
:1 20
=x:1 3
,5 9
x=1 3
×1 20
,5 9
x=1 3
,1 36
x=
÷1 36
,1 3
x=
;1 12
(4)
=1.25 2.25
,x 1.6
2.25x=1.25×1.6,
x=
,1.25×1.6 2.25
x=
.8 9