Question

1 stiind ca 3x+6y+19=43 afla 6x+38+3x 2 stiind ca x+y+75=124 afla 101+y+x. Stiind ca 5x+7y+3=230 afla 1000+2y+3x+2x+5y????? Dau cuoroana

Answer 1

1)

3 x + 6 y + 19 = 43

3 x + 6 y = 43 - 19

3 ( x + 2 y ) = 24

x + 2 y = 24 : 3

x + 2 y = 8

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6 y + 38 + 3 x = 3 x + 6 y + 38 = 43 + 38 = 81

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2)

x + y + 75 = 124

x + y = 124 - 75

x + y = 49

101 + x + y = 101 + 49 = 150

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3)

5 x + 7 y + 3 = 230

5 x + 7 y = 230 - 3

5 x + 7 y = 227

1 000 + 2 y + 3 x + 2 x + 5 y =  1 000 + 227 = 1 227

= 1 000 + 5 x + 7 y =

= 1 000 + 227 =

= 1 227