计算表面积和体积.
(78.6﹣0.786×25十75%×21.4)÷15×1997.
324×11.25+65.8×112.58888008×125 0.525÷13125÷4×85.2
①②0.25×0.09×8 ③1÷[÷(1﹣)]④×18+×11.
0.387×76000﹣387×66+84×387+38.7×60101×99×999+999.
合理、灵活地计算. 14.15﹣(7﹣6)﹣2.125×+× (111+999)÷[56×(﹣)] 6.45×0.75+4.55×75%﹣.