5x- 4.45=2.5x+0.8怎么解?
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解:解方程, 此方程的解为x = 21/10,【即x = 2.1】
5x - 4.45 = 2.5x + 0.8
5x - 2.5x = 0.8 + 4.45
5x - [(2×10+5)/10]x = 8/10 + (4×100+45)/100
5x - (25/10)x = 4/5 + 445/100
(50/10)x - (25/10)x = 80/100 + 445/100
(25/10)x = 525/100
(5/2)x = 21/4
x = 21/4 ÷ 5/2
x = 21/4 × 2/5
x = 21/10
∴x = 2.1
答:此方程的解为x = 21/10,【即x = 2.1】
5x - 4.45 = 2.5x + 0.8
5x - 2.5x = 0.8 + 4.45
5x - [(2×10+5)/10]x = 8/10 + (4×100+45)/100
5x - (25/10)x = 4/5 + 445/100
(50/10)x - (25/10)x = 80/100 + 445/100
(25/10)x = 525/100
(5/2)x = 21/4
x = 21/4 ÷ 5/2
x = 21/4 × 2/5
x = 21/10
∴x = 2.1
答:此方程的解为x = 21/10,【即x = 2.1】
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