问题
解答题
解方程. X:1.2=3:4
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答案
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9,
(2)
=30%,x 4
x:4=3:10,
10x=4×3,
10x÷10=12÷10,
x=1.2,
(3)
x-3 8
x=3 16
,3 8
x=3 16
,3 8
x×3 16
=16 3
×3 8
,16 3
x=2.
解方程. X:1.2=3:4
|
(1)x:1.2=3:4,
4x=1.2×3,
4x÷4=3.6÷4,
x=0.9,
(2)
=30%,x 4
x:4=3:10,
10x=4×3,
10x÷10=12÷10,
x=1.2,
(3)
x-3 8
x=3 16
,3 8
x=3 16
,3 8
x×3 16
=16 3
×3 8
,16 3
x=2.