Question

Se:
A= -X-2Y+10
B= X+Y+1
C= -3X-2Y+1
Então A-B-C é igual a?

ساعدوني

Answer 1

$A= -X-2Y+10\\ B=X+Y+1\\ C=-3X-2Y+1\\\text{Assim:}\,\,A-B-C\\ (-X-2Y+10)-(X+Y+1)-(-3X-2Y+1)\rightarrow\\ -X-2Y+10-X-Y-1+3X+2Y-1=X-Y+8$