若a+b=3,ab=2,则3a+2ab+3b值为多少
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若a+b=3,ab=2,则3a+2ab+3b值为多少
若a+b=3,ab=2,则3a+2ab+3b值为多少
若a+b=3,ab=2,则3a+2ab+3b值为多少
3a+2ab+3b=3(a+b)+2ab=3*3+2*2=9+4=13
3a+2ab+3b=3a+3b+2ab=3(a+b)+2ab
∵a+b=3,ab=2
∴3(a+b)+2ab=3x3+2x2=9+4=13
即3a+2ab+3b=13
3a+2ab+3b=3(a+b)+2ab
=3*3+2*2
=9+4
=13
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