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256:x=4, 40-3x=2+3², 5(3x+7) =500​

256x4 403x23 53x7 500 class=

Răspuns :

256:x=4

x=256:4

x=33

40-3x=2²+3²

-3x=4+9-40

-3x=-27

x=9

5(3x+7) =500

15x+35=500

15x=500-35

15x=465

x=31