Question

afla a+b stiind ca:
a=21:7x2+81:9x4
b=78:8+35-(48:6+45:5)

Answer 1

a=(copiezi inca o data exercitiul)
a= 3x2+9x4
a=6+36
a=42

b= (copiezi inca o data exercitiul)
b=78:8+35-(8+9)
b=9,75+35-17
b=9,75+19
b=28,75


a+b= 42+28,75
a+b= 70,75

Answer 2

[tex]a=21:7*2+81:9*4\\ a=3*2+9*4\\ a=6+36\\ a=42\\\\ b=78:8+35-(48:6+45:5)\\ b=9,75+35-(8+9)\\ b=44,75-17\\ b=27,75\\\\ a+b\ \textless \ =\ \textgreater \ 42+27,75=69,75(rotunjit=70)[/tex]