解：a^2b+ab^2=ab(a+b)把a+b=6,ab=7代入得原式=7*6=42所以a^2b+ab^2=42
a^2b+ab^2=ab(a+b)=7*6=42
..... a2b+ab2=(a+b)ab ∵ab=7,a+b=6 ∴a2b+ab2=6×7=42
