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(1) 三角形面積=底*高/2 4a³;-2a²;b+6ab²;=2a*h/2 h=4a²;-2ab+6b²; (2) h=4a²;-2ab+6b²; =4*2²;-2*2*1+6*1²; =16-4+6 =18 如仍有疑惑,歡迎追問.祝:
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