问题
解答题
解方程(或比例). 3.2x-4×3=52 x:1.5=3:5
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答案
(1)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(2)x:1.5=3:5,
5x=1.5×3,
5x÷5=1.5×3÷5,
x=0.9;
(3)
=50%,x 4
x=4×50%,
x=4×0.5,
x=2.
解方程(或比例). 3.2x-4×3=52 x:1.5=3:5
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(1)3.2x-4×3=52,
3.2x-12=52,
3.2x-12+12=52+12,
3.2x=64,
3.2x÷3.2=64÷3.2,
x=20;
(2)x:1.5=3:5,
5x=1.5×3,
5x÷5=1.5×3÷5,
x=0.9;
(3)
=50%,x 4
x=4×50%,
x=4×0.5,
x=2.