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calculeaza numarul necunoscut 42:(dx3)=21:3

Răspuns :

[tex]42 \div (d \times 3) = 21 \div 3[/tex]

[tex]42 \div 3d = 7[/tex]

[tex]3d = 42 \div 7[/tex]

[tex]3d = 6[/tex]

[tex]d = 6 \:\div\:3[/tex]

[tex]d = 2[/tex]
42 : ( d x 3 ) = 21 : 3

42 : ( d x 3 ) = 7

42 = 7 x 3d

42 = 21d

d = 42 : 21

d = 2