Mathematics
Junior High
かっこ11番の問題で、丸をつけている所は、なぜマイナスなのですか?
(⑪
8
=Y+9x7+4-6x -12x+
=ァ* 3 2 ェ
2 or
6Y +13x" -12x+4 0 |
"っ 2念の
-2で+5)(x-6G+9) = (7 +3x-10)(x"了3x-54) バ
= (G+39-100(G" 139ー5
=(Go+33)) - 64 +3)つ540
=*+6x+9x* -64x* -192x-340
=x+6x' -55r* -192x-540
回
⑬⑪ *
ィ
ま
@⑫) 2
⑬ <
⑭ 1
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やっぱりそうですよね!