2m²+13mn+6n²-44
=（2m²+4mn）+（9mn+6n²）-44
=2(m²+2mn)+3(3mn+2n²)-44
=2*13+3*21-44
=26+63-44
=45
已知m²+2mn＝13,3mn+2n²＝21,求2m²+13mn+6n²-44的值
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