Question

Calculeaza exercitiile.

a) 42 + (42x8) =
b) 78 - (32+20) =
c) 9420 - [(42x3) + (36x5) + (82x2)] =
d) 220 + (220 + 50) + (220 + 220 + 50) =
e) 456 + (456 - 50) + (456 - 50 - 50) =
f) 240 + (320x2) + (240 - 50) =
g) 8960 - [(220x2) + 420 + 200] =
h) 1 428 - [(224x2) + (69x3)] =

Answer 1

Salut,



a) 42 + (42·8) = 42 + 336 = 378


b) 78 – (32 + 20) = 78 – 52 = 26


c) 9.420 – [(42·3) + (36·5) + (82·2)] = 9.420 – (126 + 180 + 164) = 9.420 – (306 + 164) = 9.420 – 470 = 8.950


d) 220 + (220 + 50) + (220 + 220 + 50) = 220 + 270 + (440 + 50) = 220 + 270 + 490 = 490 + 490 = 980


e) 456 + (456 – 50) + (456 – 50 – 50) = 456 + 406 + (406 – 50) = 456 + 406 + 356 = 862 + 356 = 1.218


f) 240 + (320·2) + (240 – 50) = 240 + 640 + 190 = 880 + 190 = 1.070


g) 8.960 – [(220·2) + 420 + 200] = 8.960 – (440 + 420 + 200) = 8.960 – (860 + 200) = 8.960 – 1.060 = 7.900


h) 1.428 – [(224·2) + (69·3)] = 1.428 – (448 + 207) = 1.428 – 655 = 773

Answer 2

a) 42+(42*8)=
   =42+336
   =378

b) 78-(32+20)=
   =78-52
   =26

c) 9420-[(42*3)+(36*5)+(82*2)]=
   =9420-(126+180+164)
   =9420-(306+164)
   =9420-470
   =8950

d) 220+(220+50)+(220+220+50)=
  =220+270+(440+50)
  =220+270+490
  =490+490
  =980

e) 456+(456-50)+(456-50-50)=
   =456+406+(406-50)
   =456+406+356
   =862+356
   =1218

f) 240+(320*2)+(240-59)=8960-9448+
  =240+640+190
  =880+190
  =1070

g) 8960-[(220*2)+420+200]=
   =8960-(440+420+200)
   =8960-(860+200)
   =8960-1060
   =7900

h) 1428-[(224*2)+(69*3)]=
   =1428-(448+207)
   =1428-655
   =773