4/11(x-9)+1/2x=x-9怎么做? 5
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解:解方程, 此方程的解为x = 42
4/11(x - 9) + 1/2x = x - 9
(4/11)x - 4/11 × 9 + (1/2)x = x - 9
(4/11)x - 36/11 + (1/2)x = x - 9
(8/22)x - 36/11 + (11/22)x = x - 9
(19/22)x - 36/11 = x - 9
x - (19/22)x = -36/11 + 9
(22/22)x - (19/22)x = -36/11 + 99/11
(3/22)x = 63/11
x = 63/11 ÷ 3/22
x = 63/11 × 22/3
∴x = 42
答:此方程的解为x = 42
4/11(x - 9) + 1/2x = x - 9
(4/11)x - 4/11 × 9 + (1/2)x = x - 9
(4/11)x - 36/11 + (1/2)x = x - 9
(8/22)x - 36/11 + (11/22)x = x - 9
(19/22)x - 36/11 = x - 9
x - (19/22)x = -36/11 + 9
(22/22)x - (19/22)x = -36/11 + 99/11
(3/22)x = 63/11
x = 63/11 ÷ 3/22
x = 63/11 × 22/3
∴x = 42
答:此方程的解为x = 42
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