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b- dłuższy bok
9,9dm= 99cm
2a+2*b=99cm
2a+2*(a+7,7)=99
2a+ 2a+ 15,4=99
4a + 15,4=99
4a = 99 - 15,4
4a = 83,6
a=20,9
b=20,9+7,7=28,6
9,9 dm=99 cm
99=2a+2(a+7,7)
99=2a+2a+15,4
4a=83,6
a=20,9 cm
b=20,9+7,7
b=28,6 cm
9,9 dm=99 cm
99=2a+2(a+7,7)
99=2a+2a+15,4
4a=83,6
a=20,9 cm
b=20,9+7,7
b=28,6 cm