①2.5×1.67×0.4
②2.1÷0.35+0.45
③9.65×4.9+9.65×6.1-9.65
④20.4÷8.5×(6.5-5)
1.43+6.07=
11.7﹣8.9=
3.2÷0.8=
0.58+0.42×0=
4.5÷5=
1.25×0.8=
0.5×0.6=
1.8×4÷1.8×4=
①11.6+0.5-7.6
②14.25+3.72+5.75+6.28
③0.25×13×4
④15.83-(5.83+1.2)
⑤12.34-2.81-6.19
⑥17.9-12.4-2.4
=800-800
=0
=2.1÷2.1
=1