解比例。
|
(1)
=
150x=2..4×25
x=0.4 (2)2.8:
=0.7:x
2.8x=0.7×
x=0.2 (3)
:
=x:9
x=
×9
x=
(4)
:(x-6)=
:1
(x-6) =
x=
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(2)
=
(3)x:6=0.7:0.28(4)20:3=50:x
