Question

1. [(a+1881:9)×81+18]×9=17631×12. 2. 128×6:(282-x=192

Answer 1

1.
[(a+1 881:9)×81+18]×9=17 631×12
[(a+209)×81+18]×9=211 572
(a+209)×81+18=211 572:9
(a+209)×81+18=23 508
(a+209)×81=23 508-18
(a+209)×81=23 490
a+209=23 490:81
a+209=290
a=290-209
a=81



2.
128×6:(282-x)=192
768:(282-x)=192
282-x=768:192
282-x=4
x=282-4
x=278