80+8x=(90+3x)×2+怎么解?
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解:解方程, 此方程的解为x = 50
80 + 8x = (90 + 3x) × 2
80 + 8x = 90 × 2 + 3x × 2
80 + 8x = 180 + 6x
8x - 6x = 180 - 80
(8-6)x = 100
2x = 100
x = 100 ÷ 2
x = 100 × 1/2
x = 100/2
x = (50×2)/2
∴x = 50
答:此方程的解为x = 50
80 + 8x = (90 + 3x) × 2
80 + 8x = 90 × 2 + 3x × 2
80 + 8x = 180 + 6x
8x - 6x = 180 - 80
(8-6)x = 100
2x = 100
x = 100 ÷ 2
x = 100 × 1/2
x = 100/2
x = (50×2)/2
∴x = 50
答:此方程的解为x = 50
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