4x减2.5x等于7.5这个怎么算?
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解:解方程,此方程的解为x = 5
4x - 2.5x = 7.5
4x - [(2×10+5)/10]x = (7×10+5)/10
4x - (25/10)x = 75/10
4x - (5/2)x = 15/2
(8/2)x - (5/2)x = 15/2
(3/2)x = 15/2
x = 15/2 ÷ 3/2
x = 15/2 × 2/3
∴x = 5
答:此方程的解为x = 5
4x - 2.5x = 7.5
4x - [(2×10+5)/10]x = (7×10+5)/10
4x - (25/10)x = 75/10
4x - (5/2)x = 15/2
(8/2)x - (5/2)x = 15/2
(3/2)x = 15/2
x = 15/2 ÷ 3/2
x = 15/2 × 2/3
∴x = 5
答:此方程的解为x = 5
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