(3x-2)平方 丨y-3|=0,5(x-y)-2(6x-2y 2) (4x-3 y-二分之一)值

2024-11-01 10:25:12
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(3x-2)²+|y-3|=0,
因为(3x-2)²≥0,|y-3|≥0,
所以(3x-2)²=0,|y-3|=0,
得到x=2/3,y=3,
5(x-y)-2(6x-2y+2)(4x-3y-1/2)
=5×(2/3-3)-2×(6×2/3-2×3+2)×(4×2/3-3×3-1/2)
=5×(-7/3)-2×0×(4×2/3-3×3-1/2)
=-35/3-0
=-35/3