第一题:6.27*3.6+37.8*0.36
=62.7×0.36+37.8×0.36
=0.36×（62.7+37.8）
=0.36×100+0.36×0.5
=36+0.18
=36.18
第二题:369*0.99+3.69
=369×0.99+369×0.01
=369×（0.99+0.01）
=369×1
=369
第三题：（0.64+0.32）/0.64
=0.64÷0.64+0.32÷0.64
=1+0.5
=1.5
第四题：13.5*2.5-0.35*25
=13.5×2.5-3.5×2.5
=（13.5-3.5）×2.5
=10×2.5
=25
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