解方程(或比例).4X+3×0.7=6.53.5X+1.5X=25
解方程(或比例).4X+3×0.7=6.53.5X+1.5X=25X:8=34:15....
解方程(或比例).4X+3×0.7=6.53.5X+1.5X=25X:8=34:15.
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(1)4X+3×0.7=6.5,
4X+2.1=6.5,
4X+2.1-2.1=6.5-2.1,
4X=4.4,
4X÷4=4.4÷4,
X=1.1;
(2)3.5X+1.5X=25,
(3.5+1.5)X=25,
5X=25,
5X÷5=25÷5,
X=5;
(3)X:8=
:
,
X=8×
,
X×5=6×5,
X=30.
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