1-0.09=0.91; 2÷0.02=100; 0.25×8.5×4=8.5; 0.32=0.09;
5π=15.7; [1/4]×[2/3]=[1/6];31×197≈600; 5÷[1/4]×4=80;
[3/4]÷75%=1;[1/2]-[1/3]+[1/6]=[1/3].
1-0.09=0.91; 2÷0.02=100; 0.25×8.5×4=8.5; 0.32=0.09;
5π=15.7; [1/4]×[2/3]=[1/6];31×197≈600; 5÷[1/4]×4=80;
[3/4]÷75%=1;[1/2]-[1/3]+[1/6]=[1/3].