Current location - Loan Platform Complete Network - Local tax - 20 12 years adaptability exercise of key middle schools in Ningbo 17 question 7 ("the whole product" is true and heavy) Find the answer+answer the questions as follows: For any ...
20 12 years adaptability exercise of key middle schools in Ningbo 17 question 7 ("the whole product" is true and heavy) Find the answer+answer the questions as follows: For any ...
(X^2+ 1)/2
In fact, X and Y are equivalent. You just need to switch X and Y to have a new equation.
F(Y+X)=2F(X)+(Y+ 1)(Y+2X+ 1)
The upper and lower equations are equal, and then expand them to know the answer! Do the math yourself!