如题所述
解:解方程, 此方程的解为x = 29/2,【即x = 14.5】
X - 7.9 + 5.4 = 12
x - (7×10+9)/10 + (5×10+4)/10 = 12
x - 79/10 + 54/10 = 12
x - 25/10 = 120/10
x = 120/10 + 25/10
x = 145/10
x = 29/2
∴x = 14.5
答:此方程的解为x = 29/2,【即x = 14.5】
X - 7.9 + 5.4 = 12
x - (7×10+9)/10 + (5×10+4)/10 = 12
x - 79/10 + 54/10 = 12
x - 25/10 = 120/10
x = 120/10 + 25/10
x = 145/10
x = 29/2
∴x = 14.5
答:此方程的解为x = 29/2,【即x = 14.5】
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第1个回答 2020-04-14
X-7.9+5.4=12
解:X+5.4=12+7.9
X=19.9-5.4
X=14.9
解:X+5.4=12+7.9
X=19.9-5.4
X=14.9