X-0.75X=1.75 方程怎么解?
2个回答
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解:解方程,此方程的解为x = 7
x - 0.75x = 1.75
(1 - 0.75)x = (1×100+75)/100
(100/100 - 75/100)x = 175/100
(25/100)x = 7/4
(1/4)x = 7/4
x = 7/4 ÷ 1/4
x = 7/4 × 4
∴x = 7
答:此方程的解为x = 7
x - 0.75x = 1.75
(1 - 0.75)x = (1×100+75)/100
(100/100 - 75/100)x = 175/100
(25/100)x = 7/4
(1/4)x = 7/4
x = 7/4 ÷ 1/4
x = 7/4 × 4
∴x = 7
答:此方程的解为x = 7
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这是小学题,你解的我怎么有点看不懂呢?
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方法二
X - 0.75X = 1.75
(1 - 0.75)x = 1.75
0.25x = 1.75
x = 1.75 ÷ 0.25
∴x = 7
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