3x-2.5x=1.5
2个回答
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解:解方程, 此方程的解为x = 3
3x - 2.5x = 1.5
3x - [(2×10+5)/10]x = (1×10+5)/10
3x - (25/10)x = 15/10
(30/10)x - (25/10)x = 3/2
(5/10)x = 3/2
(1/2)x = 3/2
x = 3/2 ÷ 1/2
x = 3/2 × 2
∴x = 3
答:此方程的解为x = 3
3x - 2.5x = 1.5
3x - [(2×10+5)/10]x = (1×10+5)/10
3x - (25/10)x = 15/10
(30/10)x - (25/10)x = 3/2
(5/10)x = 3/2
(1/2)x = 3/2
x = 3/2 ÷ 1/2
x = 3/2 × 2
∴x = 3
答:此方程的解为x = 3
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