18.6-3.4×2.7
7.4+2.3×1.6
0.045×0.08=
4.56×0.25=
18.6×2.7-8.6×2.7
32.5×1.4+67.5×1.4
0.125×5.6×8
12.5×0.8×2.7
0.4×7.9×2.5
4.7×3.6+5.3×3.6