20+4×(x+2)=6x-2怎么解?
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解:解方程, 此方程的解为x = 15
20 + 4 × (x + 2) = 6x - 2
20 + 4x + 4 × 2 = 6x - 2
20 + 4x + 8 = 6x - 2
4x + 28 = 6x - 2
6x - 4x = 28 + 2
2x = 30
x = 30 ÷ 2
x = 30 × 1/2
x = 30/2
∴x = 15
答:此方程的解为x = 15
20 + 4 × (x + 2) = 6x - 2
20 + 4x + 4 × 2 = 6x - 2
20 + 4x + 8 = 6x - 2
4x + 28 = 6x - 2
6x - 4x = 28 + 2
2x = 30
x = 30 ÷ 2
x = 30 × 1/2
x = 30/2
∴x = 15
答:此方程的解为x = 15
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