Question

dau coroana 3 Scoateti mai intai factorul comun si apoi calculati: A) 2xa+2xb, daca a + b = 0 b) 7xa-7xb, daca a - b = 30 c) 3xa+3xb-3xc, daca a + b - c = 0 d) 2xa+10xb,daca a + 5b = 43 e) 14xa-2xb,daca 7a - b = 17 f) 10x+15xy-5xz, daca 2x + 3y - z = 39 g) ax+bx, daca a + b = 57 si x = 134 h) ax-bx,daca a-b = 89 si x = 756 i) ax-(bx+cx), daca a - (b+c) = 47 si x = 13 j) 167x568+568x833

Answer 1

Răspuns:

A)2×a+2×b=2×(a+b)=2×0=0 B)7×a-7×b=7×(a-b)=7×30=210