Question

a=100-(8x2+7x8)=
b=(9x8+7x7)-120=
c = 6+3x6-20

a-b-c=
a+2(b+c)=
a+3xb+c=

Answer 1

a=100-(8x2+7x8)
a=100-(16+56)
a=100-72
a=28

b=(9x8+7x7)-120
b=(72+49)-120
b=121-120
b=1

c=6+3x6-20
c=6+18-20
c=24-20
c=4

Deci:a=28
b=1
c=4

a-b-c=28-1-4=23
a+2(b+c)=
28+2(1+4)=
28+2x5=
28+10=38

a+3xb+c=
28+3x1+4=
28+3+4=31+4=35

Mult succes la școală!