х-ойлаған сан

.......а) (х÷2)×302=82478

(х÷2)=82478÷302

х÷2=273

х=273×2

х=546

......ә) (1098-х)×13=28776-20456

(1098-х)×13=8320

(1098-х)=8320÷13

1098-х=640

х=1098-640

х=458

.........б) ((х×3)-20)÷5=50

(х×3)-20=5×50

(х×3)-20=250

(х×3)=250+20

х×3=270

х=270÷3

х=90