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A kind of operation: a*b=a+b, a b=a-b, where a, b are rational numbers.
A*a*b*3ab+5a*ab #4ab=a+a+b+3ab+5a+ab-4ab=7a+b
A =5, b =3,=38
A*B*3ab+5a #4ab=B*3ab+5a+ab-4ab=7a
A=5, B=3,=38
Specify a new operation, a*b=a+b, a #b=a-b,其中,a,b为有理数,化简a²b*3ab+5a²b#4ab results in () A 6a2b+ab B -4a2b+7ab C 4a2b-7ab D 6a2b-ab Specify a new operation, a*b=a+b, a #b=a-b,其中,a,b为有理数,化简a²b*3ab+5a²b#4ab, and the result is () A 6a2b+ab B -4a2b+7ab C 4a2b-7ab D 6a2b-ab
A2b*3ab+5a2b #4ab 这题还是有点意思的常用思路是:a²b+3ab+5a²b-4ab=6a²b-ab选D但是这是在我们默认为*,# priority is higher than +, just like 2*3+2. You must calculate all of * first, and then you will find that a2...
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