-x²-4y²+4xy 3ax²+6axy+3ay² 9分之m²n²+3分之2mn²那个最后一题最后一点没打出来 题目其实是这样的:9/m²n²+3/2m n三次方+n的四次方
问题描述:
-x²-4y²+4xy 3ax²+6axy+3ay² 9分之m²n²+3分之2mn²
那个最后一题最后一点没打出来 题目其实是这样的:9/m²n²+3/2m n三次方+n的四次方
答
-x²-4y²+4xy
=-(x²+(2y)²-4xy )
=-(x-2y)²
3ax²+6axy+3ay²
=3a(x²+2xy+y²)
=3a(x+y)²
m²n²/9+2mn² /3
=mn²(m+6)/9
答
-x²-4y²+4xy
=-(x²+4y²-4xy)
=-(x+y)²
3ax²+6axy+3ay²
=3a(x²+2xy+y²)
=3a(x+y)²
9分之m²n²+3分之2mn²
=m²n²+6mn²
=mn²(m+6)
答
-x²-4y²+4xy
=-(x²-4xy+4y²)
=-[x²-2×2xy+(2y)²]
=-(x-2y)²
=-(x-2y)(x-2y)
3ax²+6axy+3ay²
=3a(x²+2xy+y² )
=3a(x+y)²
=3a(x+y)(x+y)
9分之m²n²+3分之2mn²
=9分之m²n²+9分之6mn²
=1/9(m²n²+6mn²)
=1/9mn²(m+6)
答
-x²-4y²+4xy=-(x-2y)²
3ax²+6axy+3ay² =3a(x+y)²
m²n²/9+2mn²/ 3=mn²(m+6)/ 9
答
-x²-4y²+4xy
=-(x²-4xy+4y²)
=-(x-2y)²
3ax²+6axy+3ay²
=3a(x²+2xy+y²)
=3a(x+y)²
9分之m²n²+3分之2mn²
=9分之mn²(m+6)