Răspuns
4·[5(2x+9)-10³]:3²=20
4·[5(2x+9)-1000]:9=20
[5(2x+9)-1000]:9=20:4
5(2x+9)-1000=5·9
10x=45+1000-45
10x=1000
x=1000:10
x=100
[20(x:40-24)·75·100:15-9980]·40=800
20(x:40-24)·75·100:15-9980=800:40
20(x:40-24)·75·100:15=20+9980
(x:40-24)·75·100:15=10000:20
(x:40-24)·75·100=500·15
(x:40-24)·75=7500:100
x:40-24=75:75
x:40=1+24
x=25·40
x=1000