180-40÷2=
300÷20=
6×15=
84×(5-5)=
1-0.99=
2.1+3.9=
800×4=
10×5÷10×5=
13.4+5.97+6.6
35.26-7.8-15.26
0.080.11 0.30.29
0.040.4 0.180.22