① x³y²-x³=② 25(m+n)²-81(m-n)²=③ 2x³-8x=
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① x³y²-x³=② 25(m+n)²-81(m-n)²=③ 2x³-8x=
① x³y²-x³=
② 25(m+n)²-81(m-n)²=
③ 2x³-8x=
① x³y²-x³=② 25(m+n)²-81(m-n)²=③ 2x³-8x=
① x³y²-x³
=x³(y²-1)
=x³(y+1)(y-1)
② 25(m+n)²-81(m-n)²
=[5(m+n)+9(m-n)]*[5(m+n)-9(m-n)]
=(14m-4n)(14n-4m)
=4(7m-2n)(7n-2m)
③ 2x³-8x
=2x(x²-4)
=2x(x+2)(x-2)
肯定对,
① x³y²-x³
=x³(y²-1)
=x³(y+1)(y-1)
② 25(m+n)²-81(m-n)²
=[5(m+n)+9(m-n)]*[5(m+n)-9(m-n)]
=(14m-4n)(14n-4m)
③ 2x³-8x
=2x(x²-4)
=2x(x+2)(x-2)