用递等式计算.(能简算的要写出简算过程)(1)8.5×[(2.36+2.42)÷0.25] (2)3.9÷[(1.3+0.6)×6﹣3.6] (3)4.25×6.3+3.7×4.25(4)205×0.99 (5)25.6﹣7.49﹣2.51 (6)[2.5﹣(6.8﹣4.9)]×0.8.
36×72+36×27+36 125×32×25 4.64﹣(0.64+3.62)21÷9+22÷9+23÷9+24÷9 199999.9+19999.8+1999.9+199.8+19.9+0.7.
321×3.3﹣123÷= 326 .
(7.5+7.5+7.5+7.5)×125×4.
1999+999×999.
8888008×125.