合理计算.12÷(+) ×(﹣) ×33%+33%÷5.
①②③④99×88+88×77+77×66+66×55.
(78.6﹣0.786×25十75%×21.4)÷15×1997.
324×11.25+65.8×112.5 8888008×125 0.525÷13 125÷4×85.2
① ②0.25×0.09×8③1÷[÷(1﹣)] ④×18+×11.
0.387×76000﹣387×66+84×387+38.7×60 101×99×999+999 .