(400一2x)x3+4x+5x=1560?
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解:解方程,此方程的解为x = 120
(400 一 2x) x 3 + 4x + 5x = 1560
400 × 3 - 2x × 3 + 4x + 5x = 1560
1200 - 6x + 4x + 5x = 1560
1200 + (-6x + 4x + 5x)= 1560
1200 + 3x = 1560
3x = 1560 - 1200
3x = 360
x = 360 ÷ 3
x = 360 × 1/3
x = 360/3
x = (120×3)/3
∴x = 120
答:此方程的解为x = 120
(400 一 2x) x 3 + 4x + 5x = 1560
400 × 3 - 2x × 3 + 4x + 5x = 1560
1200 - 6x + 4x + 5x = 1560
1200 + (-6x + 4x + 5x)= 1560
1200 + 3x = 1560
3x = 1560 - 1200
3x = 360
x = 360 ÷ 3
x = 360 × 1/3
x = 360/3
x = (120×3)/3
∴x = 120
答:此方程的解为x = 120
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