Question

1)Efectuati: a) (72-27)÷9+27×15÷5= b) (72-16)÷8+45×23= c) (6×13+5×28)-72÷4= d) (56-21)÷7(18+24)÷6=

Answer 1

a) 45:9+25x15:5=5+375:5=5+75=80
b) 56:8+45x23=7+1035=1042
c) (78+140)-18=218-18=200
d) 35:7x42:6=5x42:6=210:6=35

Answer 2

a) (72-27)÷9+27×15÷5=
=45÷9+405÷5=
=5+81=
86

b) (72-16)÷8+45×23=
=56÷8+1035=
=7+1035=
=1042

c) (6×13+5×28)-72÷4=
=(78+140)-18=
=218-18=
=200

d) (56-21)÷7:(18+24)÷6=
=35÷7:42÷6=
=7:7=
=1
 
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