-3(2a-三分之二y²)+2(-1.5a+y²)等于多少
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-3(2a-三分之二y²)+2(-1.5a+y²)等于多少
-3(2a-三分之二y²)+2(-1.5a+y²)等于多少
-3(2a-三分之二y²)+2(-1.5a+y²)等于多少
-3(2a-三分之二y²)+2(-1.5a+y²)
=-6a+2y²-3a+2y²
=-9a+4y²