计算下面各题，能简算的要简算．
1.25×2.5×0.832.64÷2.04×0.3
1.5×101﹣1.510.1×7.8
13÷0.4÷2.52.8×7.3+0.27×28．
用递等式计算．
600﹣（4.06+6.4）×0.5 3.69×7.5+36.9×0.25．
用递等式计算，能简便的要简便计算
8.3﹣2.4×1.523.4÷7.8+2.1 2.5×6.3+2.5×3.71.25×2.3×0.8．
直接写出得数．
0.5×0.8=0.03+1.7=0.63÷0.07=2.5×3.1×0.4=
4÷0.01=1﹣0.66=7.2×0.6=0.2×0.2÷0.2×0.2=
脱式计算，能简算要简算．
72.8÷2.5÷40.83×7.2+0.83×2.818.305÷0.14﹣58.67 7.8×9.9．