问题
解答题
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答案
(1)
=x 25
,1.2 75
75x=25×1.2,
75x÷75=30÷75,
x=0.4,
(2)
=1.25 0.25
,x 1.6
0.25x=1.25×1.6,
0.25÷0.25=2÷0.25,
x=8,
(3)
:4 9
=x:15,1 6
x=1 6
×15,4 9
x÷1 6
=1 6
÷20 3
,1 6
x=40,
(4)8:13=20:x.
8x=13×20,
8x÷8=260÷8,
x=32.5.