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(42:7)×y=30; a×(35:5)=63; (36:4-72:9):(70:7-45:5-2×0); (32:8+4×9):(6×9-5×10):1; (15:3+27:9):(18-2×6+18:9);

Răspuns :

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Răspuns:

I) 6×y=30 => y=30÷5=6 => y=6

II) a×(35:5)=63 => a×7=63 => a=63:7 => a=9

III) (9-8):(10-9-0)= 1:1=1

IV) (4+36):(54-50):1 = 40:4:1= 10:1= 10

V) (5+3):(18-12+2)=8:(6+2)=8:8=1

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