Question types of mathematical inequality in senior high school
Multiply both sides of the formula1(a+1)+1(b+1) =1by (a+ 1)(b+ 1) to simplify the left and right. =2 xy, you can get a+2b >; Under the root number 2 = a2b, according to ab= 1, A+2B >; =2, so the minimum value is 2.