Question

La ex 7 pls dau 50 de puncte pls urgent

Answer 1

Salut!

Explicație pas cu pas:

7)

a) 2a+3(b+c)=2×5+3×10=10+30=40

b) 4a+2(a+7)+b+c=4×5+2(5+7)+10=20+2×12+10=20+24+10=44+10=54

c) 15-2a+3(b+c)-(a+3)=15-2×5+3×10-(5+3)=15-10+30-8=5+30-8=358=27

Răspuns:

a) 40 b) 54 c) 27

Answer 2

$\it a=5,\ \ \ b+c=10\\ \\ a)\ 2a+3(b+c)=2\cdot5+3\cdot10=10+30=40\\ \\ b)\ 4a+2(a+7)+b+c=4\cdot5+2\cdot(5+7)+10=20+24+10=54\\ \\ c)\ 15-2a+3(b+c)-(a+3)=15-2\cdot5+3\cdot10-(5+3)=\\ \\ =15-10+30-8=27$