Răspuns:
7.
a.198-[29×(56:2-50:2)-(5×11-24)]:[(86:2+47):2-(18+23)]=
=198-[29×(28-25)-(55-24)]:[(43+47):2-41]=
=198-(29×3-31):(90:2-41)=
=198-(87-31):(45-41)=
=198-56:4=
=198-14=
=184
b. [257+(64-33)]:[(37+27):(44-42)-(52-37)×(70:2-33)]=
=(257+31):[64:2-15×(35-33)]=
=288:(64:2-15×2)=
=288:(32-30)=
=288:2=
=144
c. 265×13-[(35×42-23×51)-64×2]×30-(72×29+12×15×3)=
=265×13-[(1470-1173)-64×2]×30-(2088+180×3)=
=265×13-(297-64×2)×30-(2088+540)=
=265×13-(297-128)×30-2628=
=265×13-169×30-2628=
=3445-5070-2628=
=3445-2442=
=1003
