1/2ⅹ-30=9/10x+20怎么解?
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解:解方程,此方程的解为x = -125
1/2ⅹ- 30 = 9/10x + 20
(1/2)x - 30 = (9/10)x + 20
(9/10)x - (1/2)x = -30 - 20
(9/10)x - (5/10)x = -50
(4/10)x = -50
(2/5)x = -50
x = -50 ÷ 2/5
x = -50 × 5/2
∴x = -125
答:此方程的解为x = -125
1/2ⅹ- 30 = 9/10x + 20
(1/2)x - 30 = (9/10)x + 20
(9/10)x - (1/2)x = -30 - 20
(9/10)x - (5/10)x = -50
(4/10)x = -50
(2/5)x = -50
x = -50 ÷ 2/5
x = -50 × 5/2
∴x = -125
答:此方程的解为x = -125
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