Question

Toate exercitiile da ca se poate! Daca nu, este bine si doar un sau doua exercitii.

Answer 1

Răspuns:

23.

a=-7-77-777

a=-861

b=3+33+333

b=369

a-b=-861-(+369)=-861-368=-1229

22.

a)15+(-20)-(-16)=15-20+16=11

b)-(-8+4)-(-9+16)+(-7-10)=8-4+9-16-7-10=-20

c)-24-(-50)+(-10)=-24+59-10=25

d)x+(-8-x)-(-10+7)=x-8-x+10-7=-5

e)[-10+(-2+5-11)-(-9)]+(-13)=(-10-2+5-11+9)-13=-9-13=-22

f)-1+{-2+[-3-(-4+5-6)]}-7=-1+[-2+(-3+4-5+6)]=-1+(-2-3+4-5+6)=-1-2-3+4-5+6=-1

21.

a)-4+x=-12

x=-12+5

x=-7

b)x+(+13)=+5

x+13=5

x=5-13

x=-8

c)-63-x=-80

-x=-80+63

-x=-17/:(-1)

x=17

d)x-(-100)=-100

x+100=-100

x=-100-100

x=-200

e)x-(-23)=32

x+23=32

x=32-23

x=9

f)-4-x=0

-x=4/:(-1)

x=-4

20.

a)29-(-76)+(-108)=29+79-108=0

b)-7-(-77)+(-707)=-7+77-707=-637

c)-57-(-136)-(+49)=-57+136-49=30

d)+905-(-590)+(-509)-(+950)=905+590-590-950=0

e)-100-(-100)+(-200)-(-300)=-100+100-200+300=100

f)-100+(-200)-(-300)=-100-200+300=0