Odpowiedzi

2009-12-13T16:19:12+01:00
2009-12-13T16:22:00+01:00
4(1/4+1)^2-2(1-2*1/4)^2+(2*1/4-3)*(3+2*1/4)=4×1¼÷2-2×(-¾)÷2+2×1,25=5÷0×(-¾)=0
2009-12-13T16:22:54+01:00
4(1/4+1)²-2(1-2*1/4)²+(2*1/4-3)*(3+2*1/4)=
=4*(5/4)²-2*(1/2)²+(1/2-3)(3+1/2)=
=4*25/16 - 2*1/4+(-5/2)*(7/2)=
=25/4-1/2-35/4=25/4-2/4-35/4=-12/4=-3