(Ⅹ-39)×5/4=7/3X+39怎么解?
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解:解方程,此方程的解为x = -81
(x - 39)× 5/4 = (7/3)x + 39
(5/4)x - 39 × 5/4 = (7/3)x + 39
(5/4)x - 195/4 = (7/3)x + 39
(7/3)x - (5/4)x = -195/4 - 39
(28/12)x - (15/12)x = -195/4 - 156/4
(13/12)x = -351/4
x = -351/4 ÷ 13/12
x = -351/4 × 12/13
∴x = -81
答:此方程的解为x = -81
(x - 39)× 5/4 = (7/3)x + 39
(5/4)x - 39 × 5/4 = (7/3)x + 39
(5/4)x - 195/4 = (7/3)x + 39
(7/3)x - (5/4)x = -195/4 - 39
(28/12)x - (15/12)x = -195/4 - 156/4
(13/12)x = -351/4
x = -351/4 ÷ 13/12
x = -351/4 × 12/13
∴x = -81
答:此方程的解为x = -81
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