Question

ajutor
dau coroana la cel care răspunde la toate ex​
și cu explicatii

Answer 1

Respectam regulile de calcul:

- si + = -

- si - = +

+ si - = -

+ si + = +

Daca avem -x-y=-(x+y)

Daca avem -x+y, daca x>y, atunci va fi -(x-y), iar daca avem y>x atunci va fi +(y-x)

a)

(-15+16)× (17-25)=1×(-8)=-8

b)

(28-32)×(-13+20)=-4×7=-28

c)

(35-32)×(-8+11)=3×3=9

d)

(11-17)×(-12+16)=-6×4=-24

e)

(69-96)×(142-156)=-27×(-14)=378

f)

(258-253)×(-572+391)=5×(-181)=-905

g)

(26-21)×(61-257)=5×(-196)=-980

h)

-2×[-4+3(-26+28)-2(-1+2)]=

-2×(-4+3×2-2×1)=

-2×(-4+6-2)=0

i)

5×[8-3(-6+4)+2(1-3)]=

5×[8-3×(-2)+2×(-2)]=

5(8+6-4)=

5×10=50

j)

-7×[-2+5(5-6)-4(-16+14)]=

-7(-2-5+8)=

-7×1=-7

k)

-139×[711-394(-22+24)]=

-139×(711-394×2)=

-139×(711-788)=

-139×(-77)=10703

l)

249×[-317(34-35)-2315]=

249×(317-2315)=

249×(-1998)=-497502

m)

-11×{18×(-15)+10×[(-12)×13-48×(-4)]}=

-11×[-270+10(-156+192)]=

-11×(-270+360)=

-11×90=-990

n)

-15×{72+16×[-261-12×(-13)-25×(-4)]}=

-15×{72+16×(-261+156+100)]=

-15×(72-80)=

-15×(-8)=120

o)

134×{-101-417×[-27×(-38)-817-211]-739}=

134×[-101-417×(1026-1028)-739]=

134×[-101-417×(-2)-739]=

134(-101+834-739)=

134×(-6)=-804