14公式法求解.因式分解①(x²y²)²-4x²y²②5x²
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14公式法求解.
因式分解
①(x²y²)²-4x²y²
②5x²-2x+1/5
③9(a-b)²+30(a-b)(a+b)+25(a+b)²
④(x²-2x)²+2x(x-2)+1
⑤2m²n²+8mn+8+x(mn+2)²
⑥(a-b)²(3a-2)(2-3a)a²
✿✿✿✿✿✿计算✿✿✿✿✿✿
800²-1600×799+799²
✿✿✿✿✿✿✿✿✿✿✿✿✿✿
回答完的给分.
因式分解
①(x²y²)²-4x²y²
②5x²-2x+1/5
③9(a-b)²+30(a-b)(a+b)+25(a+b)²
④(x²-2x)²+2x(x-2)+1
⑤2m²n²+8mn+8+x(mn+2)²
⑥(a-b)²(3a-2)(2-3a)a²
✿✿✿✿✿✿计算✿✿✿✿✿✿
800²-1600×799+799²
✿✿✿✿✿✿✿✿✿✿✿✿✿✿
回答完的给分.
①(x²y²)²-4x²y²
=(x²y²-4)x²y²
=(xy+2)(xy-2)x²y²
②5x²-2x+1/5
=(√5x)²-2(√5)/(√5)x+(1/(√5))²
=(√5x-1/(√5))²
③9(a-b)²+30(a-b)(a+b)+25(a+b)²
=(3(a-b)+5(a+b))²
=(8a+2b)²
④(x²-2x)²+2x(x-2)+1
=(x(x-2))²+2x(x-2)+1
=(x(x-2)+1)²
=((x-1)²)²
=~~
⑤2m²n²+8mn+8+x(mn+2)²
=2(m²n²+4mn+4)+x(mn+2)²
=2(mn+2)²+x(mn+2)²
=(2+x)(mn+2)²
⑥(a-b)²(3a-2)(2-3a)a²
=-((a-b)(3a-b)a)²
###
800²-1600×799+799²
=(800-799)²
=1
=(x²y²-4)x²y²
=(xy+2)(xy-2)x²y²
②5x²-2x+1/5
=(√5x)²-2(√5)/(√5)x+(1/(√5))²
=(√5x-1/(√5))²
③9(a-b)²+30(a-b)(a+b)+25(a+b)²
=(3(a-b)+5(a+b))²
=(8a+2b)²
④(x²-2x)²+2x(x-2)+1
=(x(x-2))²+2x(x-2)+1
=(x(x-2)+1)²
=((x-1)²)²
=~~
⑤2m²n²+8mn+8+x(mn+2)²
=2(m²n²+4mn+4)+x(mn+2)²
=2(mn+2)²+x(mn+2)²
=(2+x)(mn+2)²
⑥(a-b)²(3a-2)(2-3a)a²
=-((a-b)(3a-b)a)²
###
800²-1600×799+799²
=(800-799)²
=1