4.-(a+1)²+9(a-2)²刚才的提问已经被百度吞掉了
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4.-(a+1)²+9(a-2)²刚才的提问已经被百度吞掉了
4.-(a+1)²+9(a-2)²
刚才的提问已经被百度吞掉了
4.-(a+1)²+9(a-2)²刚才的提问已经被百度吞掉了
-(a+1)²+9(a-2)²
=9(a-2)²-(a+1)²
=[3(a-2)+(a+1)][3(a-2)-(a+1)]
=[3a-6+a+1][3a-6-a-1]
=(4a-5)(2a-7)
原式=9(a-2)^2-(a+1)^2
=(3a-6)^2-(a+1)^2
=(3a-6+a+1)(3a-6-a-1)
=(4a-5)(2a-7)
-(a+1)²+9(a-2)²
=9(a-2)²-(a+1)²
=(3a-6)²-(a+1)² 9=3²
=(3a-6+a+1)(3a-6-a-1) 平方差
=(4a-5)(2a-7)
4-(a平方+2a+1)+9(a平方-4a+4)
=4-a平方-2a-1+9a平方-36a+36
=8a平方-38a+39