Question

Fie nr. a b si c. Daca : a=9×7-2×4-5×10 b=98-(7×7+3×7+5×3) c=(13+7×4)-39 calculeaza: a)3×a+3×c-b= b)b+4×a-2×c= c)(a+c)×9-b=

Answer 1

a=72-8-50
a=14

b=98-(49+21+15)
b=98-85
b=13

c=(13+28)-39
c=41-39
c=2

Si acum inlocium

a)3x14+3x2-13=
42+6-13=35

b)13+4x14-2x2=
13+56-4=65

c)(14+2)x9-13=
16x9-13=
144-13=131