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已知(x-3)2+|y+1|+z2=0,求x2-2xy-5x2+12xz+3xy-z2-8xz-2x2的值.

提供几道难题

(一)填空 3.3ab-4ab+8ab-7ab+ab=______. 4.7x-(5x-5y)-y=______. 5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______. 6.-7x2+6x+13x2-4x-5x2=______. 7.2y+(-2y+5)-(3y+2)=______. 11.(2x2-3xy+4y2)+(x2+2xy-3y2)=______. 12.2a-(3a-2b+2)+(3a-4b-1)=______. 13.-6x2-7x2+15x2-2x2=______. 14.2x-(x+3y)-(-x-y)-(x-y)=______. 16.2x+

要初一计算题

1. -3(x2-xy)-x(-2y+2x) ⑵ (-x5)•x3n-1+x3n•(-x)4 2. (x+2)(y+3)-(x+1)(y-2) ⑷ (-2m2n)3•mn+(-7m7n12)0-2(mn)-4•m11•n8 3. (5x2y3-4x3y2+6x)÷6x,其中x=-2,y=2 ⑹ (3mn+1)(3mn-1)-(3mn-2)2 4. 9992-1 ⑻ 20032 5. -2.5×(-4.8)×(0.09)÷(-0.27) 3.3ab-4ab+8ab-7ab+ab=______. 4.7x-(5x-5y)-y=______. 5.23a3bc2-15ab2c+8abc-24a3bc

求这个线性规划的方程的解 急

1.18.1+(3-0.299÷0.23)×1 2.(6.8-6.8×0.55)÷8.5 3.0.12× 4.8÷0.12×4.84 4.2×1.5+2.5÷(-1.6) 5.(-2)×3.2×(1.5+2.5)÷1.6 6.6-1.6÷4+(6.8-9) 7.38+7.85-5.37÷89 8.7.2÷0.8-1.2×5 9.-1.19×3-0.43 10.6.5×(4.8-1.2×4) 11.68×1.9+0.32×1.9 12.10.15-10.75×0.4-5.7 13.5.8×(3.87-0.13) 14.(-8.01)+4.2×3.74 15.32.52-(6+9.728÷3.2)

已知(x-3)²+|y+1|+z²=0

解 (x-3)²+|y+1|+z²=0 (x-3)²≥0 /y+1/≥0 z²≥0 ∴ x=3.y=-1.z=0 x²-2xy-5x²+12xz+3xy-z²-8xz-2x²——没写错吧? =(-6x²)+xy-z²+4xz =-6×9-3×1 =-54-3 =-57

已知(x-3)²+|y+1|+z=0,求:x²-2xy-(5x²-12xz-3xy)-(z²+8xz+2x²

告诉你第一个式子可知道。x=3 y=-1 z=0,给你3个答案,然后自己算把
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