一减二分之一x等于四十分之二十一怎么解?
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解:解方程, 此方程的解为x = 19/20,【即x = 0.95】
一减二分之一x等于四十分之二十一
1 - (1/2)x = 21/40
(1/2)x = 1 - 21/40
(1/2)x = 40/40 - 21/40
(1/2)x = 19/40
x = 19/40 ÷ 1/2
x = 19/40 × 2
x = 19/(20×2)× 2
x = 19/20
∴x = 0.95
答:此方程的解为x = 19/20,【即x = 0.95】
一减二分之一x等于四十分之二十一
1 - (1/2)x = 21/40
(1/2)x = 1 - 21/40
(1/2)x = 40/40 - 21/40
(1/2)x = 19/40
x = 19/40 ÷ 1/2
x = 19/40 × 2
x = 19/(20×2)× 2
x = 19/20
∴x = 0.95
答:此方程的解为x = 19/20,【即x = 0.95】
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