问题
解答题
解比例: (1)x:24=3:8 (2)8.1:x=1.8:36 (3)
(4)
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答案
(1)x:24=3:8,
8x=24×3,
x=
,24×3 8
x=9,
(2)8.1:x=1.8:36,
1.8x=8.1×36,
x=
,8.1×36 1.8
x=162,
(3)
:1 2
=6:x2 3
x=1 2
×6,2 3
x=4,1 2
x=4÷
,1 2
x=8,
(4)
=4.8 1.6
. x 2
1.6x=4.8×2,
x=
,4.8×2 1.6
x=6.