(1)M^2+M-3M^2-5M+2M^2+4=?(M=-3/4)(2)(A+B)^2-2(A+B)^2+3(A+B)^2=?(A=-2 B=1/3)(3)2/3A^2-6A^3+5A-1/4+5A^3-1/2-4/3A^2=?(A=-3)(4)5XY-3/2X^3Y^2-4XY+1/2X^3Y^2-1/2XY-3X^3Y^2-5=?(X=-1 Y=-2)(5)已知:2M^2N+2MN-3NM^2-3NM+43^2N 其中M是最小正整数,N是绝
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![(1)M^2+M-3M^2-5M+2M^2+4=?(M=-3/4)(2)(A+B)^2-2(A+B)^2+3(A+B)^2=?(A=-2 B=1/3)(3)2/3A^2-6A^3+5A-1/4+5A^3-1/2-4/3A^2=?(A=-3)(4)5XY-3/2X^3Y^2-4XY+1/2X^3Y^2-1/2XY-3X^3Y^2-5=?(X=-1 Y=-2)(5)已知:2M^2N+2MN-3NM^2-3NM+43^2N 其中M是最小正整数,N是绝](/uploads/image/z/3693399-15-9.jpg?t=%281%29M%5E2%2BM-3M%5E2-5M%2B2M%5E2%2B4%3D%3F%28M%3D-3%2F4%29%282%29%28A%2BB%29%5E2-2%28A%2BB%29%5E2%2B3%28A%2BB%29%5E2%3D%3F%28A%3D-2+B%3D1%2F3%29%283%292%2F3A%5E2-6A%5E3%2B5A-1%2F4%2B5A%5E3-1%2F2-4%2F3A%5E2%3D%3F%28A%3D-3%29%284%295XY-3%2F2X%5E3Y%5E2-4XY%2B1%2F2X%5E3Y%5E2-1%2F2XY-3X%5E3Y%5E2-5%3D%3F%28X%3D-1+Y%3D-2%29%285%29%E5%B7%B2%E7%9F%A5%EF%BC%9A2M%5E2N%2B2MN-3NM%5E2-3NM%2B43%5E2N+%E5%85%B6%E4%B8%ADM%E6%98%AF%E6%9C%80%E5%B0%8F%E6%AD%A3%E6%95%B4%E6%95%B0%2CN%E6%98%AF%E7%BB%9D)
(1)M^2+M-3M^2-5M+2M^2+4=?(M=-3/4)(2)(A+B)^2-2(A+B)^2+3(A+B)^2=?(A=-2 B=1/3)(3)2/3A^2-6A^3+5A-1/4+5A^3-1/2-4/3A^2=?(A=-3)(4)5XY-3/2X^3Y^2-4XY+1/2X^3Y^2-1/2XY-3X^3Y^2-5=?(X=-1 Y=-2)(5)已知:2M^2N+2MN-3NM^2-3NM+43^2N 其中M是最小正整数,N是绝
(1)M^2+M-3M^2-5M+2M^2+4=?(M=-3/4)
(2)(A+B)^2-2(A+B)^2+3(A+B)^2=?(A=-2 B=1/3)
(3)2/3A^2-6A^3+5A-1/4+5A^3-1/2-4/3A^2=?(A=-3)
(4)5XY-3/2X^3Y^2-4XY+1/2X^3Y^2-1/2XY-3X^3Y^2-5=?(X=-1 Y=-2)
(5)已知:2M^2N+2MN-3NM^2-3NM+43^2N 其中M是最小正整数,N是绝对值等于1的数
(1)M^2+M-3M^2-5M+2M^2+4=?(M=-3/4)(2)(A+B)^2-2(A+B)^2+3(A+B)^2=?(A=-2 B=1/3)(3)2/3A^2-6A^3+5A-1/4+5A^3-1/2-4/3A^2=?(A=-3)(4)5XY-3/2X^3Y^2-4XY+1/2X^3Y^2-1/2XY-3X^3Y^2-5=?(X=-1 Y=-2)(5)已知:2M^2N+2MN-3NM^2-3NM+43^2N 其中M是最小正整数,N是绝
(1)M^2+M-3M^2-5M+2M^2+4
=4-4M=7
(2)(A+B)^2-2(A+B)^2+3(A+B)^2
=2(A+B)^2=50/9
(3)2/3A^2-6A^3+5A-1/4+5A^3-1/2-4/3A^2
=-1/2+5A-2/3A^2-A^3=-105,1/2=-211/2
(4)5XY-3/2X^3Y^2-4XY+1/2X^3Y^2-1/2XY-3X^3Y^2-5
=-4X^3Y^2+1/2XY-5=12
(5)最后一项(43^2N )是不是4M^2N?
其中M是最小正整数,M=1;N是绝对值等于1的数N=+/-1
2M^2N+2MN-3NM^2-3NM+4M^2N
=3M^2N-NM
=5N=+/-5