-(7y-3z)-(8y-5z)
=-7y+3z-8y+5z
=-15y+8z
-(7y-3z)-(8y-5z)计算!
2个回答
相关问题
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(7y-3z)-(8y-5z)=-y+2z
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{7x+3y-5z=8 y:x:z=5:3:8
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化简：（7y-3z）-（8y-5z）=______．
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3x+4z=7 2x+3y+z=9 5x+9y+7z=8 2x+y+z=9 x+2y+z=8 x+y+2z=7 三元一次
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解方程组3x+y+2z=8,x+y+z=5,2x+3y+4z=7
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2x-3y+4z=2 4x+y+7z=3 8x+2y+3z=-5
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方程组3x-y+2z=7 2x+y-4z=-8 7x+y-5z=-6怎么做?
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3X+7Y+Z=5,4X+8Y+2Z=3,则X+Y+Z的值为
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5x-3y+3z=10 2x+y-5z=7 x+y-2z=8 这个方程的解,
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解三元一次方程x+y+z=1 x+3y+7z=-1 x+5y=8z=2