Question

[1000*0.1-900*0.1-90*0.1]*[142*0.5-240*0.25]

Answer 1

=1×11=11☺☺

Answer 2

A=((1000-900-90)*0.1)*(142*0.5-240*0.5*0.5)

A=(10*0.1)*((142-120)*0.5)

A=1*22*0.5=11

Answer 3

(1000+0,1-900×0,1-90×0,1)(142×0,5-240×0,25)=1×11=11