Question

ma ajutați va rog mult. dau coroana ​

Answer 1

Răspuns:

75.

(216×3-321×2)+18:x=9

(648-642)+18:x=9

6+18:x=9

18:x=9-6=3

18=3x

x=18:3

x=6

76.

(x-21:3+7×5):6=10

x-7+35=10×6=60

x-7=60-35=25

x=25+7

x=32

77.

(11-x:5+6×4):4=8

11-x:5+24=8×4=32

11-x:5=32-24=8

-x:5=8-11=-3

-x=-3×5=-15

x=15

78.

(51-36:x+9×3):8=9

51-36:x+27=9×8=72

51-36:x=72-27=45

-36:x=45-51=6

-36=6x

6x=36

x=36:6

x=6

79.

(23-42:7+y×7):9=5

23-6+7y=5×9=45

-6+7y=45-23=22

7y=22+6=28

y=28:7

y=4

Explicație pas cu pas:

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