Va rog ma ajuta cineva la exercițiile incercuite

Exercitiul 1 :

B=8:2+5
B=9
A=9x3
A=27
C=9x2+27
C=45
A+B+C=27+9+45
A+B+C=81
D=100-81
D=19
C-D=45-19
C-D=26

Exercitiul 2 :

A=(9+8:2-9:3):2
A=10:2
A=5

B=7-15:(8-6:2)
B=7-15:5
B=7-3
B=4

C=(8+16):3+3x(18-4x3)
C=24:3+3x6
C=8+12
C=20

5x5+3x4-20=17

8x5+6x4-2x20=24

Au fost foarte simple.

iti scriu direct rezolvarea ex 82
10+75-7=78
6+120+9=135
100-9+208=299
420+200-10=610
 ex 83
280-21+0=259
349+36+10=495
520+10-72+9=467
7*5+9=44
1+9+168-72=106
49+86+0+1=136
44+88-(48-21)+(145+7)=44+88-27+152=257
(84-64)/5+(18/2+85)=20/5+(9+85)=4+94=98
ex 85
a=(9+4-3)/2
a=10/2
a=5
b=7-15/3
b=7-3
b=4
c=24/3+3*6
c=26
5*5+3*4-26=25+12-26=37-26=11
8*5+6*4-2*26=40+24-52=64-52=12