[5+(9 -x)]4÷2=4x÷2方程怎么解?
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解:解方程,此方程的解为x = 7
[5 + (9 - x)]4 ÷ 2 = 4x ÷ 2
(5 + 9 - x)× 4 ÷ 2 = 4x ÷ 2
(14 - x)× 4 ÷ 2 = 4x ÷ 2
(56 - 4x)÷ 2 = 4x ÷ 2
(56 - 4x)× 1/2 = 4x × 1/2
28 - 2x = 2x
2x + 2x = 28
4x = 28
x = 28 ÷ 4
x = 28 × 1/4
x = 28/4
∴x = 7
答:此方程的解为x = 7
[5 + (9 - x)]4 ÷ 2 = 4x ÷ 2
(5 + 9 - x)× 4 ÷ 2 = 4x ÷ 2
(14 - x)× 4 ÷ 2 = 4x ÷ 2
(56 - 4x)÷ 2 = 4x ÷ 2
(56 - 4x)× 1/2 = 4x × 1/2
28 - 2x = 2x
2x + 2x = 28
4x = 28
x = 28 ÷ 4
x = 28 × 1/4
x = 28/4
∴x = 7
答:此方程的解为x = 7
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