x的4倍减去23等于6.8,x是多少?
3个回答
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解:此方程的解为x = 149/20,【即x = 7.45】
∵已知x的4倍减去23等于6.8
需求出x是多少
∴x × 4 - 23 = 6.8
4x - 23 = (6×10+8)/10
4x - 23 = 68/10
4x - 23 = 34/5
4x = 34/5 + 23
4x = 34/5 + 115/5
4x = 149/5
x = 149/5 ÷ 4
x = 149/5 × 1/4
x = 149/20
∴x = 7.45
答:此方程的解为x = 149/20,【即x = 7.45】
∵已知x的4倍减去23等于6.8
需求出x是多少
∴x × 4 - 23 = 6.8
4x - 23 = (6×10+8)/10
4x - 23 = 68/10
4x - 23 = 34/5
4x = 34/5 + 23
4x = 34/5 + 115/5
4x = 149/5
x = 149/5 ÷ 4
x = 149/5 × 1/4
x = 149/20
∴x = 7.45
答:此方程的解为x = 149/20,【即x = 7.45】
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