3.5+4.2= 3.5-0.9= 8.4＋11.6= 3.62＋0.08=
2.3×0.2= 7.5÷0.5= 0.6元+1.5元= 7.8元-5.8元 =
7.6-7.6×0= 5×0.6= 6.7×100= 0.7米-0.3米=
2.8×5= 1.9×30= 400×0.5= 1.25×0.8=
1.2×4= 13×0.4= 25×0.08= 2.5×7×4=
4÷0.4= 0.99÷0.01= 5.47÷5.47= 7a+8a=
5.6÷4= 3.9÷13= 2÷0.04= 0.36÷100=
