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A family of three travel to the North during the holiday. There are two local travel agencies, a and B, whose prices are the same, but there are concessions for family travel. A travel agency says that adults don't discount, while children get 60% off. B travel agency says that all three people get 20% off. After accounting, B travel agency wants 240 yuan cheaper. How much is the adult's price?
Suppose the price of adult is x yuan, according to the meaning of the question: 2x + 60% x-3x · 80% = 240, the solution is: x = 1200
Factorization:
【1】16（a-b）²+24（b-a）（a+b）+9（b+a）²
【2】（x²+4X+3）(x²+12x+35)+15
1、16（a-b）²+24（b-a）（a+b）+9（b+a）²=[4（a-b）]²-2*4*3（a-b）（a+b）+[3（b+a）]²=[4(a-b)-3(a+b)]²=(a-7b)²2、（x²+4X+3）(x²+12x+35)+15=（x+1）(x+3)(x+5)(x+7)...
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