Mathematics
Junior High
△DEF…の②が分かりません！なるべく分かりやすく解説して欲しいです！
このとき,次の三角形の面積積を a.bを使って表しなさい。
D ACDF=
-3acm
D
)cm?
A
bcm
E
② ADEF=
人
)cm?
2acm
B-2bcm F
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