已知方程2x-3y+4z-10=0,3x+2y-5z-15=0,则x-8y+13z=( )
1个回答
因2x-3y+4z-10=0
所以4x-6y+8z=20 (1)
另3x+2y-5z=15 (2)
所以(1)-(2)=x-8y+13z=5
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