求未知数:x.12x+7×0.3=20.1 &n...
求未知数:x.12x+7×0.3=20.135x+5×4=95x:42=57:10...
求未知数:x.12x+7×0.3=20.1 35x+5×4=95 x:42=57:10
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(1)12x+7×0.3=20.1
12x+2.1=20.1
12x+2.1-2.1=20.1-2.1
12x=18
12x÷12=18÷12
x=1.5;
(2)
x+5×4=95
x+20=95
x+20-20=95-20
x=75
x×
=75×
x=125;
(3)x:42=
:10
10x=42×
10x=30
10x÷10=30÷10
x=3.
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