若a+b=3,ab=1,求代数式3a+5ab+3b的值

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若a+b=3,ab=1,求代数式3a+5ab+3b的值
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若a+b=3,ab=1,求代数式3a+5ab+3b的值
若a+b=3,ab=1,求代数式3a+5ab+3b的值

若a+b=3,ab=1,求代数式3a+5ab+3b的值
原式=3(a+b)+5ab
=3×3+5×1
=14

3a+5ab+3b
=3(a+b)+5ab
=3×3+5
=14

3a+5ab+3b
=3a+3b+5ab
=3(a+b)+5ab
=3x3+5x1
=9+5
=14

3a+5ab+3b
=3(a+b)+5ab
=3×3+5×1
=9+5
=14

3a+5ab+3b
=3(a+b)+5ab
=3*3+5*1
=9+5
=14

我晕 , 等于14啊

3a加3b等于3倍a加b 提示但这,自己算……