1. 6.27×3.6+37.8×0.36=6.27×3.6+3.78×3.6=（6.27+3.78）×3.6=10×3.6=362.369×0.99+3.69=3.69×99+3.69=3.69×（99+1）=3.69×100=3693. （0.64+0.32）÷0.64=（0.32×2+0.32）÷0.64=（2+1）×0.32...