1.2x+0.5×4x+(270-x-4x)×3.5=230怎么解?
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解:解方程,此方程的解为x = 50
1.2x + 0.5 × 4x + (270 - x - 4x) × 3.5 = 230
1.2x + 2x + 945 - 3.5x - 14x = 230
3.2x - 3.5x - 14x = 230 - 945
-0.3x - 14x = -715
-14.3x = -715
x = 715 ÷ 14.3
x = 715 ÷ (14×10+3)/10
x = 715 ÷ 143/10
x = 715 × 10/143
∴x = 50
答:此方程的解为x = 50
1.2x + 0.5 × 4x + (270 - x - 4x) × 3.5 = 230
1.2x + 2x + 945 - 3.5x - 14x = 230
3.2x - 3.5x - 14x = 230 - 945
-0.3x - 14x = -715
-14.3x = -715
x = 715 ÷ 14.3
x = 715 ÷ (14×10+3)/10
x = 715 ÷ 143/10
x = 715 × 10/143
∴x = 50
答:此方程的解为x = 50
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