a{x-y]-b[y-x]+c[x-y] x[m+n]-y[n+m]+[m+n] [x+y]的平方-16[x-y]的平方 a的平方[a-b]方-b方[a-b]方总共4个题
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a{x-y]-b[y-x]+c[x-y] x[m+n]-y[n+m]+[m+n] [x+y]的平方-16[x-y]的平方 a的平方[a-b]方-b方[a-b]方总共4个题
a{x-y]-b[y-x]+c[x-y] x[m+n]-y[n+m]+[m+n] [x+y]的平方-16[x-y]的平方 a的平方[a-b]方-b方[a-b]方
总共4个题
a{x-y]-b[y-x]+c[x-y] x[m+n]-y[n+m]+[m+n] [x+y]的平方-16[x-y]的平方 a的平方[a-b]方-b方[a-b]方总共4个题
(1)7X ^ 2-63
= 7(X ^ 2-9)
= 7(x +3)(X-3)
(2)^ 3-A = A(A ^ 2-1)
= A(A 1)(A-1)
(3)3A ^ 2-3B ^ 2
= 3(一^ 2-B ^ 2)
= 3(A + B)(AB)
(4)Y ^ 2-9(X + Y)^ 2
= [Y +3( X + Y)] [Y-3(X + Y)]
=(3X +4 Y)(-3X-2Y)
(5)(XY)-B(YX)+ C (XY)
=一(XY)+ B(XY)+ C(XY)
=(A + B + C)(XY)
(6)×(M + N) - Y(N + M)+(M + N)
=×(M + N)-Y(M + N)+(M + N)
=(xy +1)(M + N)
(7)(X + Y)^ 2-16(XY)^ 2
= [(X + Y)+4(XY)] [(X + Y)-4(XY )]
=(5X-3Y)(-3X +5 Y)
(8)一^ 2(AB)^ 2-B ^ 2(A + B)^ 2
= [一(AB)+ B(A + B)] [一(AB)-B(A + B)]
=(A ^ 2 + B ^ 2)(A ^ 2-2AB-B ^ 2 )
(9)(X + Y + Z)^ 2 - (XYZ)^ 2
= [(X + Y + Z)+(XYZ)] [(X + Y + Z) - (XYZ)]
= 4×(Y + Z)
(10)(X + Y)^ 2-14(X + Y)49
= [(X + Y) - 7] ^ 2
=(X + Y-7)^ 2
(1)^ 2B ^ 2-0.01
=(AB +0.1)(AB-0.1)
>(2)X ^ 2Y-2XY ^ 2 + Y ^ 3
= Y(X ^ 2-2XY + Y ^ 2)
= Y(XY)^ 2
(3) 16 - (2a中3 B)^ 2
= [4 +(2A 3 B)] [4 - (2A 3 B)]
=(2A 3 B +4)( - 图2a-图3b +4)
(4)(一^ 2 4)^ 2-16α^ 2
= [(A ^ 2 4)4一个] [(A ^ 2 4 )-4A] =(+2)^ 2(A-2)^ 2
(5)X ^ 2-XY +1 / 4Y ^ 2
=(X-1 / 2Y)^ 2
(6)^ 2X ^ 2 +16 +64斧
=(AX +8)^ 2
(7)^ 4-8A ^ 2B ^ 2 16 B ^ 4
=(A ^ 2-4B ^ 2)^ 2
=(A +2 B)^ 2的(a-2b)中^ 2
(8)9 +图6(A + B)+(A + B)^ 2
= [3 +(A + B)] ^ 2
=(A + B 3)^ 2