Treść zadania
Autor: madziaxd Dodano: 11.1.2011 (17:54)
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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kosiu95 12.1.2011 (10:32)
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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