(2) (85/5)/0. 17= 17/0. 17=0.0 1

(3) (0. 125*2.4+0. 125*0.8)*2.5= (0.3+0. 1)*2.5=0.4*2.5= 1

(4) ( 10-0. 1)*9.9= 10*9.9-0. 1*9.9=99-0.99=98.0 1

(5) 17.3*( 10-0. 1)+ 1.73= 10* 17.3- 17.3*0. 1+ 1.73= 173

(6) 8.5*( 100-4)+34= 100*8.5-8.5*4+34=850

(7) ( 1+0. 1)+(2+0. 1)+(3+0. 1)+(4+0. 1)+(5+0. 1)=( 1+2+3+4+5)+5*0. 1= 15.5

(8) 99.9*(999+ 1+ 1)=99.9*( 1000+ 1)=99.9* 1000+99.9=99900+99.9=99999.9

(9)(3* 1.5*3*2.5*2*2.4)/( 1.5*2.5*2.4)=3*3*2= 18

( 10)(3/4)*(66+34)=(3/4)* 100=75

* Multiply/divide