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第一个照片的步骤: a = 8x-3-4x = 8x-4x-3 = 4x-3 b = 2(3x+5) - (4x+5) = 6x+10-4x-5 = 6x-4x+10-5 = 2x+5 ab = ½(4x-3)(2x+5) = ½(8x2 +20x-6x-15) = ½(8x2 +14x-15) = 4x2 + 7x - 15/2 # PQTS : (8x-3)(4x+5) = 32x2+40x-12x-15 = 32x2+28x-15 # Maka : 32x2+28x-15+(4x2+7x-15/2) = 32x2+4x2+28x+7x-15-15/2 = 36x2+35x-45/2 第二张照片的问题的解法: (a) lebar : (4x+5-x) Maka,12(4x+5)(4x-x+5) = (48x+60)(3x+5) cm (b) [48(10)+60] [3(10)+5] = (480+60) x (30 + 5) = 540 x 35 = 18900 liter Maka : Tidak, kerana terlebih sebanyak 300 ml. 答案不一定正确哦。但是请检查看看答案。