7×-(2-×)=34,求x等于多少?
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解:解方程, 此方程的解为x = 9/2,【即x = 4.5】
7x - (2 - x)= 34
7x - 2 + x = 34
7x + x - 2 = 34
8x - 2 = 34
8x = 34 + 2
8x = 36
x = 36 ÷ 8
x = 36 × 1/8
x = 36/8
x = (9×4)/(2×4)
x = 9/2
∴x = 4.5
答:此方程的解为x = 9/2,【即x = 4.5】
7x - (2 - x)= 34
7x - 2 + x = 34
7x + x - 2 = 34
8x - 2 = 34
8x = 34 + 2
8x = 36
x = 36 ÷ 8
x = 36 × 1/8
x = 36/8
x = (9×4)/(2×4)
x = 9/2
∴x = 4.5
答:此方程的解为x = 9/2,【即x = 4.5】
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