Question

Afla termenul necunoscut:​

Answer 1

(777-a)-258=220

777-a=220+258

777-a=478

a=777-478

a=299

(9191-a)+687=2000

9191-a= 2000-687

9191-a=1312

a=9191-1312

a=7879

a+30×9=500

a+270=500

a=500-270

a=230

(36:a+63:9):2=8

(36:a+7):2=8

36:a+7=8×2

36:a+7=16

36:a=16-7

36:a=9

a=36:9

a=4

6×a-6=30-2×3

6×a-6=30-6

6×a-6=24

6×a=24+6

6×a=30

a=30:6

a=5

924-(150+a)=100+2×100

924-(150+a)=100+200

924-(150+a)=300

924-150+a=300

774+a=300

a=774-300

a=474

n+(558:9+30×15)=2142

n+(62+450)=2142

n+512=2142

n=2142-512

n=1630.