28.70元×1.08≈
0.18×8.45=
17×40= 100-63= 3.2+1.68= 2.8×0.4= a×a=
14-7.4= 1.92÷0.04= 0.32×500= 0.65+4.35=
0.35×4= 8.3+6.7= 4÷9= 10.2÷0.01=
3.24×0.93.24 b÷0.78b(b≠0) 7.29×1.37.29÷1.3
2×1.0012 0.2×0.80.4×0.4
2.6060…2.601601…… 12×0.651.2×6.5
7.6×1.017.6 4.8÷1.54.8
35÷0.135×10 0.57×0.320.57÷0.32
40分 时