题目内容
解比例和方程.
1.25:0.25=x:1.6
5.4-2x=3.6
1.7x-0.2x=3.
1.25:0.25=x:1.6
5.4-2x=3.6
1.7x-0.2x=3.
(1)1.25:0.25=x:1.6,
0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8;
(2)5.4-2x=3.6,
5.4-2x+2x=3.6+2x,
2x+3.6-3.6=5.4-3.6,
2x÷2=1.8÷2,
x=0.9;
(3)1.7x-0.2x=3,
1.5x÷1.5=3÷1.5,
x=2.
0.25x=1.25×1.6,
0.25x÷0.25=2÷0.25,
x=8;
(2)5.4-2x=3.6,
5.4-2x+2x=3.6+2x,
2x+3.6-3.6=5.4-3.6,
2x÷2=1.8÷2,
x=0.9;
(3)1.7x-0.2x=3,
1.5x÷1.5=3÷1.5,
x=2.
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