4.6×6=27.6 8.9×7=62.3 15.6×13=202.8 0.18×15=2.7 0.025×14=0.35 3.06×36=110.16 脱式计算 2.5×7.1×4 16.12×99+16.12 5.2×0.9+0.9 =(2.5×4)×7.1 =16.12×(99+1) =(5.2+1)×0.9 =10×7.1 =16.12×100 =6.2×0.9 =71 =1612