1.(A+3B)(A-3B)-(2A-B)方2.-3X方-42XY+96Y方3.(X-Y)方-4(X-Y-1)

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1.(A+3B)(A-3B)-(2A-B)方2.-3X方-42XY+96Y方3.(X-Y)方-4(X-Y-1)
1.(A+3B)(A-3B)-(2A-B)方
2.-3X方-42XY+96Y方
3.(X-Y)方-4(X-Y-1)

1.(A+3B)(A-3B)-(2A-B)方2.-3X方-42XY+96Y方3.(X-Y)方-4(X-Y-1)
(A+3B)(A-3B)-(2A-B)²
=A²-9B²-4A²-B²+4AB
=-(3A²-4AB+10B²)
=-
-3X²-42XY+96Y²
=-3(X²+14XY-32Y²)
=-3(x+2y)(x-16y)
(X-Y)²-4(X-Y-1)
=(X-Y)²-4(x-y)+2²
=(x-y-2)²