3.33*1.6+6.66*4.2
=3.33×2×0.8+6.66×4.2
=6.66×0.8+6.66×4.2
=6.66×（0.8+4.2）
=6.66×5
=3.33×（2×5）
=33.38.8*43.2-33.2*5.9-33.2*2.98.8*43.2-33.2*5.9-33.2*2.9=8.8*43.2-33.2*(5.9+2.9)=8.8*43.2-33.2*58.8=8.8×（43.2-33.2）=8.8×10=88