八下数学练习题(15.2.1),1.(a+3b)*(a-3a) 2.(3x+4)*(-3+2a)3.51*49 4.(3x+4)*(3x-4)-(2x+3)*(3x-2)
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![八下数学练习题(15.2.1),1.(a+3b)*(a-3a) 2.(3x+4)*(-3+2a)3.51*49 4.(3x+4)*(3x-4)-(2x+3)*(3x-2)](/uploads/image/z/625989-21-9.jpg?t=%E5%85%AB%E4%B8%8B%E6%95%B0%E5%AD%A6%E7%BB%83%E4%B9%A0%E9%A2%98%EF%BC%8815.2.1%EF%BC%89%2C1.%28a%2B3b%29%2A%28a-3a%29+2.%283x%2B4%29%2A%28-3%2B2a%293.51%2A49+4.%283x%2B4%29%2A%283x-4%29-%282x%2B3%29%2A%283x-2%29)
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