Question

Calculati : {(-7supra 20 -9 supra 30 - 11supra 40)×[-1,(3)]-0,0(5)}:0,(4)

Answer 1

{(-7/20 -9/30 - 11/40)×[-1,(3)]-0,0(5)}:0,(4)=
1,(3)=(13-1)/9=12/9=4/3
0,0(5)=5/90
0,(4)=4/9
={(-7/20 -9/30 - 11/40)×[-1,(3)]-0,0(5)}:0,(4)=
=[(-42-36-33)/120×(-4/3)-5/90]:4/9=
=[(-111/120)×(-4/3)-5/90] ×9/4=
=(37/30-5/90) ×9/4=
=(111-5)/90 ×9/4=
=106/90 ×9/4=
=106/40=
=53/20=2,65