Question

Daca x=5 si a+b=13, calculati:
a) 3*x+7*a+7*b
b) x*a+x*b-50
c) 10*x+(4*a+4*b)
d) (4*a+4*b-2*x)*(2*a+2*b+x)

Multumesc frumos! Dau coroana! Repede!

Answer 1

Răspuns:

Explicație pas cu pas:

a)3x+7(a+b)=3×5+7×13=15+91=106

b)x(a+b)-50=5×13-50=65-50=15

c)10x+4(a+b)=10×5+4×13=50+52=102

d)[4(a+b)-2x]×[2(a+b)+x]=(4×13-10)×(26+5)=42×31=1302

Answer 2

A)= 3×5 + 7×(a+b)=

= 15 + 7×13=

= 15 × 91 = 106

B)= X( a+b)-50 =

= 5×13−50

= 65−50= 15

C)= 10×5 + 4×(a+b)=

50 + 4×13 =

= 50+ 52 = 102

D)= [4(a+b)-2×5] ×[ 2(a+b)+x]

= (4×13−10 ) × ( 2× 13+5) =

= (52-10 )×(26+5) =

= 42 × 31 = 1302