Mathematics
Junior High
なぜ、カッコをつけて展開するのか教えてください<(_ _*)>
C-18
(14) (エ+5)(.x一9) (+8) (x-8)
=ー4.c-45-(xー64)
=で-4.c-45-x+64
36xー
かっこをつけて
展開する。
=36-
=-4.c+19
4
符号に注意しよう!
-4.c+19
3_1
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