Question

13a+19b+4a-2b      [a+b=100]  tinh

 

Answer 1

 

13a+19b+4a-2b=17a+17b=17(a+b)=17.100=1700

Answer 2

13a+19b+4a-2b  = 17a + 17b = 17.(a+b) = 17. 100 = 1700

tích đúng cho mk vs ^^