求未知数x.40x=53.2 x:35=47:45 ...
求未知数x.40x=53.2x:35=47:451.2x-1.5×4=1.8....
求未知数x.40x=53.2 x:35=47:45 1.2x-1.5×4=1.8.
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(1)
=,
5x=40×3.2,
5x=128,
5x÷5=128÷5,
x=25.6;
(2)x:
=
:
,
x=×,
x×=×,
x=
;
(3)1.2x-1.5×4=1.8,
1.2x-6=1.8,
1.2x-6+6=1.8+6,
1.2x÷1.2=7.8÷1.2,
x=6.5.
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