Question

Dau 16 puncte ajutati-ma doar 2 ex 5 si 7!!!

Answer 1

5.

a)

7×8+6×7-3×7=

56+6×7-3×7=

56+42-3×7=

56+42-21=

98-21=

=77

9+5×6-25:5=

9+30-25:5=

9+30-5=

39-5=

=34

b)

7×6-12+7×10=

42-12+7×10=

42-12+70=

30+70=

=100

15-15:3+2×5×5=

15-5+2×5×5=

15-5+10×5=

15-5+50=

10+50=

=60

c)

400+4×8+72:9-48=

400+32+72:9-48=

400+32+8-48=

432+8-48=

424-48=

386

300-64:8+6×6-28=

300-8+6×6-28=

300-8+36-28=

292+36-28=

328-28=

=300

Answer 2

5.a)7×8+6×7-3×7=56+42-21=56+21=77
9+5×6-25:5=9+30-5=9+25=34
b)7×6-12+7×10=42-12+70=34+70=104
15-15:3+2×5×5=15-5+10×5=10+50=60
c)400+5×8+72:9-48=400+40+8-48=440+40=480
300-64:8+6×6-28=300-8+36-28=292+8=300
300-64:8+6×6-28=300-8+36-28=252+8=260

7.a) 2:2+2×2-2=1+4-2=1+2=3
3+3×3+3-3=3+9+1-3=12+12=14
4×4-4:4+4=16-1+4=15+4=19
b)5-5:5+5×5=5-1+25=4+25=29
6:6+6×6-6=1+36-6=1+30=31
7-7:7+7×7=7-1+49=6+49=55
c)8-8:8+8×8=8-1+64=7+64=71
9:9+9×9-9=1+81-9=1+72=73
10-10:10+10×10=10-1+100=9+100=109