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a3a4=a12 (-a3)4=a12 (ab)2=ab2 3a4a=12a
﹣2﹣(﹣2)=0 ﹣3﹣4=﹣7 ﹣7﹣(﹣3)=﹣10 12﹣15=﹣3
模型1(相关指数为0.97) 模型2(相关指数为0.89) 模型3(相关指数为0.56 ) 模型4(相关指数为0.45)
81a8b12; 12a6b7; -12a6b7; -81a8b12;
56÷7×12 56×(12÷7) 56×3×4÷7
(-1)+(-6)=+7 (-3)-(-4)=-7 (-4)×(-3)=12 (-3)÷2=-1
﹣7 7 7 9
81 a8b12 12 a6b7 ﹣12a6b7 ﹣81a8b12
81a8b12 12a6b7 ﹣12a6b7 ﹣81a8b12
a3·a4=a12 (a3)4=a7 (a2b)3=a6b3 a3÷a4=a(a≠0)