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a. (28:4) + (42:6)=

(5x7)+(30:6)
(72:9+(4x4)=
(70:7)+(2x8)=

b.(9x5)-35:5
(7x7-(28:7)
(36:4-(2x4)=
(72:8)- (3x3)

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Răspuns :

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A. (28:4) + (42:6)=7+7=14

(5x7)+(30:6)=35+5=40
(72:9+(4x4)=8+16=24
(70:7)+(2x8)==10+16=26

b.(9x5)-35:5=45-7=38
(7x7)-(28:7)=49-4=45
(36:4-(2x4)=9-8=1
(72:8)- (3x3)=9-9=0

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