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madziaxd

1. Mama ma 42 lat , a jej dzieci 12 i 8 lat . Za ile lat wiek mamy będzie równy sumie lat jej dzieci ?
2.Obecnie Mateusz ma dwa razy więcej lat od Weroniki. Za pięć lat będą mieli razem 40 lat . ile lat ma kazde z nich??
3 Obw trojkata rownobocznego jest rowny obw prostokata . Znajdz pole tego prostokata- bok a= 7cm bok b= x???
Potrzebne na jutro prosze o pomoc!!!!!!

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    42+x=12+x+8+x
    42-12-8=x+x-x
    22=x
    Spr. 42+22=12+22+8+22
    64=64
    Odp.Za 22 lata jej wiek będzie równy sumie lat jej dzieci.

    2.
    2x-wiek Mateusza
    x-wiek Weroniki

    2x+5+x+5=40
    3x=30
    x=10

    Spr. 20+5+10+5=40
    40=40
    Weronika ma 10 lat, a Mateusz 20 lat.
    3.
    x-dł. boku b prostokąta
    z-dł. boku trój, rownobocznego

    14+2x=3z
    x=1,5z-7

    pole prostokąta 7*(1,5z-7)=10,5z-35
    pole prostokąta wynosić będzie 10,5*dł. boku trójkąta równobocznego odjąć 35

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