利用因式分解计算
4、①21×3.14+62×3.14+17×3.14②758²-258²5、①(a-b)²+4ab②(p-4)(p+1)+3p③4xy...
4、①21×3.14+62×3.14+17×3.14②758²-258² 5、①(a-b)²+4ab②(p-4
)(p+1)+3p③4xy²-4x²y-y³④3ax²-3ay² 展开
)(p+1)+3p③4xy²-4x²y-y³④3ax²-3ay² 展开
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4、①21×3.14+62×3.14+17×3.14
=3.14×(21+62+17)
=3.14×100
=314
②758²-258²
=(758+258)(758-258)
=1016×500
=508000
5、①(a-b)²+4ab
=a²-2ab+b²+4ab
=a²+2ab+b²
=(a+b)²
②(p-4)(p+1)+3p
=p²-3p-4+3p
=p²-4
=(p+2)(p-2)
③4xy²-4x²y-y³
=-y(4x²-4xy+y²)
=-y(2x-y)²
④3ax²-3ay²
=3a(x²-y²)
=3a(x+y)(x-y)
=3.14×(21+62+17)
=3.14×100
=314
②758²-258²
=(758+258)(758-258)
=1016×500
=508000
5、①(a-b)²+4ab
=a²-2ab+b²+4ab
=a²+2ab+b²
=(a+b)²
②(p-4)(p+1)+3p
=p²-3p-4+3p
=p²-4
=(p+2)(p-2)
③4xy²-4x²y-y³
=-y(4x²-4xy+y²)
=-y(2x-y)²
④3ax²-3ay²
=3a(x²-y²)
=3a(x+y)(x-y)
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