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Răspuns :

Răspuns:

18)

(45:5+45:9):7+2×10:10

(9+5):7+2×10:10

=14:7+2×10:10

=2+2×10:10

=2+20÷10

=2+10

=12

19)

2×3×5+60:10:6-31

=6×5+60:10:6-31

=30+60:10:6-31

=30+6:6-31

=30+1-31

=31-31=0

20)

(100-60-30)×5+(10-6:3):8

=(40-30)×5+(10-2):8

=10×5+8:8

=50+1

=51

21)

45:5+54:6-(54+45):(4+5)

=45:5+54:6-99:9

=9+9-11

=18-11

=7

22)

(9×7-6:3)-(81-8×8)

=(63-3)-(81-64)

=61-17

=44

23)

(8×5:10+6×6)-(10+3×3)

=(40:10+36)-(10+3×3)

=(4+36)-(10+9)

=40-19

=21