Question

16. Stiind ca
a) x+y=7, calculati 4x+4y\
b)x-y=3,calculati 8x0-8y0
c) 2x+2y=8,calculati 6x+6y
d)3x+3y=9,calculati 2x3+5y2x
VA ROG REPEDE DAU COROANA SI INIMA.

Answer 1

Explicație pas cu pas:

a) x+y=7

4x+4y = 4(x+y) = 4×7 = 28

b)x-y=3

8x⁰-8y⁰ = 8×1 - 8×1 = 8 - 8 = 0

sau:

8x-8y = 8(x-y) = 8×3 = 24

c) 2x+2y=8 <=> 2(x+y) = 8 => x+y = 4

6x+6y = 6(x+y) = 6×4 = 24

d)3x+3y=9 <=> 3(x+y) = 9 => x+y = 3