Question

1 Calculează:
3 x 4 +21:
3-56:8=
a)
b)
56 - 280 : 7 + 320 : 8 =
c)
4 x 5 x 2: 8 x 6:3 x 25 =
d)
345 - (76 x 2 - 55:5) + 244 : 4 =
e)
1 000 - 11 x 32 + 445 : 5 =
f)
300 x 4:5 - 560 : 80 =
6 x 43 - 184 : 4 + 639 : 3 =​

Answer 1

Răspuns:

a) 3×4=12

12+21=33

b)280:7=40

320:8=40

56-40=16+40=56

c)4×5=20×2=40:8=5×6=30:3=10×25=250

d)76×2=152

55:5=11

152-11=141

244:4=61

345-141=204+61=265

e)11×32=352

445:5=89

1000-352=648+89=737

f)300×4=1200:5=240

560:80=7

240-7=237

Answer 2

a) 3 x 4 +21:3-56:8=

12+7-7= 12

b) 56 - 280 : 7 + 320 : 8 =

56- 40+ 40= 56

c) 4 x 5 x 2: 8 x 6:3 x 25 =250

d) 345 - (76 x 2 - 55:5) + 244 : 4 =

345-(152- 11)+244:4

345- 141+ 244:4

345-141+61

265

e)1 000 - 11 x 32 + 445 : 5 =

1000-352+ 89

737

f)300 x 4:5 - 560 : 80 =

1200:5-7

240-7

233

g) 6 x 43 - 184 : 4 + 639 : 3 =

258- 46+ 213

425