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b=3/4a
2a+2b=28
b=3/4a
2a+2*3/4a=28
b=3/4a
2a+6/4a=28
b=3/4a
3,5a=28 /:3,5
a=8
b=3/4*8
a=8
b=6
d=dł. przekatnej
d=√[a²+b²]=√[8²+6²]=√100
d=10cm
{
{2a+ 1 1/2a = 28
{{
{3,5a=28
{{
{a=8
{
{a=8
{
{a=8
{
{a=8
{b=
{a=8
{b=10 - przekątna