方程7x-2(5-x)=7.5x-6.4怎么解?
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解:解方程, 此方程的解为x = 12/5,【即x = 2.4】
7x - 2(5 - x) = 7.5x - 6.4
7x - 2 × 5 + 2x = 7.5x - 6.4
7x - 10 + 2x = [(7×10+5)/10]x - (6×10+4)/10
9x - 10 = (75/10)x - 64/10
9x - (75/10)x = -64/10 + 10
(90/10)x - (75/10)x = -64/10 + 100/10
(15/10)x = 36/10
x = 36/10 ÷ 15/10
x = 18/5 ÷ 3/2
x = 18/5 × 2/3
x = 12/5
∴x = 2.4
答:此方程的解为x = 12/5,【即x = 2.4】
7x - 2(5 - x) = 7.5x - 6.4
7x - 2 × 5 + 2x = 7.5x - 6.4
7x - 10 + 2x = [(7×10+5)/10]x - (6×10+4)/10
9x - 10 = (75/10)x - 64/10
9x - (75/10)x = -64/10 + 10
(90/10)x - (75/10)x = -64/10 + 100/10
(15/10)x = 36/10
x = 36/10 ÷ 15/10
x = 18/5 ÷ 3/2
x = 18/5 × 2/3
x = 12/5
∴x = 2.4
答:此方程的解为x = 12/5,【即x = 2.4】
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