=15x2-44x+32
(8)=(a+1)(2a+5)
=(−1)·2a²+((−1).5+1.2)a+1.5
=-2a2-3a +5
(9)=(-2a+b)(7a-2b)
=(-2)-7a2+(-2)-(-2)+1-7)ab
=-14a2+11ab-262
=a²+(2b)²+(-1)²+2. a. 26-
+2.26.(-1)+2.(−1). a
=a2+4b2+1+4ab-4b-2a
=a²+4ab+4b2-2a-4b+1
(3) 与式={(x2-2x)-32
=(x²-2x)2-6(x²-2x) +9
=(x-4x+4x2)-6x²+12x+9
+1.(-2)62
=x-4x³-2x²+12x+9
8
別解 与式
数学Ⅰ
問題