0.8×4= 0.25×0.4= 5.3-1.7= 9.8÷ 100= 0.72÷0.8=
6×0.5= 3.6÷0.09= 10×3.75= 0.32= 2y+7y=
4.8÷1.6= 0.58×10= 0.25×4= 10÷0.125=
1.05÷0.1= 3.6÷3= 0.23×0.02= 15÷60=
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)
有个;有个。