X-2/5 X+120=X-4/15 X怎么解?
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解:解方程, 此方程的解为x = 902/3
x - (2/5)x + 120 = x - 4/15
(5/5)x - (2/5)x - x + 120 = -4/15
(3/5)x - (5/5)x + 120 = -4/15
-(2/5)x + 120 = -4/15
(2/5)x = 120 + 4/15
(2/5)x = 1800/15 + 4/15
(2/5)x = 1804/15
x = 1804/15 ÷ 2/5
x = 1804/15 × 5/2
∴x = 902/3
答:此方程的解为x = 902/3
x - (2/5)x + 120 = x - 4/15
(5/5)x - (2/5)x - x + 120 = -4/15
(3/5)x - (5/5)x + 120 = -4/15
-(2/5)x + 120 = -4/15
(2/5)x = 120 + 4/15
(2/5)x = 1800/15 + 4/15
(2/5)x = 1804/15
x = 1804/15 ÷ 2/5
x = 1804/15 × 5/2
∴x = 902/3
答:此方程的解为x = 902/3
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