А)
(78÷13)+(3×65)=6+195=201
530+(68÷17)=530+4=534
(21×20)+(85÷17)=420+5=425
(92÷23)+(25×3)=4+75=79
(61×2)+(50÷25)=122+2=124
б)
1000-(84÷21)=1000-4=996
(60×3)-(360÷4)=180-90=90
(250×3)-(78÷26)=750-3=747
(250+350)-(750÷25)=600-30=570
(900-50)-(64÷16)=850-4=846