x- ekierka
x+1 - zeszyt
a.
3*x+ 2*(x+1)=11
3x+2x+2=11
5x=11-2
5x=9 |/5
x=1.80zł.-ekierka
zeszyt- 2.80
b.
5*(x+1)+3*x
5*2.80+3*1.80=14+5.40=19.40zł
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x- ekierka
x+1 - zeszyt
a.
3*x+ 2*(x+1)=11
3x+2x+2=11
5x=11-2
5x=9 |/5
x=1.80zł.-ekierka
zeszyt- 2.80
b.
5*(x+1)+3*x
5*2.80+3*1.80=14+5.40=19.40zł