(2012•晋城)解比例和方程.
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(2012•晋城)解比例和方程.
(1)5.4+2x=8.6
(2)2.5:5=x:8
(3)0.2=1-
(1)5.4+2x=8.6
(2)2.5:5=x:8
(3)0.2=1-
x |
24 |
(1)5.4+2x=8.6,
5.4+2x-5.4=8.6-5.4,
2x=3.2,
2x÷2=3.2÷2,
x=1.6;
(2)2.5:5=x:8,
5x=2.5×8,
5x=20,
5x÷5=20÷5,
x=4;
(3)0.2=1-
x
24,
0.2+
x
24=1-
x
24+
x
24,
0.2+
x
24=1,
0.2+
x
24-0.2=1-0.2,
x
24=0.8,
x
24×24=0.8×24,
x=19.2.
5.4+2x-5.4=8.6-5.4,
2x=3.2,
2x÷2=3.2÷2,
x=1.6;
(2)2.5:5=x:8,
5x=2.5×8,
5x=20,
5x÷5=20÷5,
x=4;
(3)0.2=1-
x
24,
0.2+
x
24=1-
x
24+
x
24,
0.2+
x
24=1,
0.2+
x
24-0.2=1-0.2,
x
24=0.8,
x
24×24=0.8×24,
x=19.2.