计算.(1)64+4×7 (2)854÷(55﹣48)(3)(49+23)×4.
脱式计算,能简算的要简算(1) (2) (3)12.87+3.65+1.35(4)74.6×19+19×25.4 (5) (6)168.1÷(4.5×2﹣0.8)
4.56×0.27+483×0.0456+1.9×4.56+0.456×30= .
20.01×314+200.1×31.4+2001×3.14= .
99+11×19+11×80 .
123×5.67+8.77×567= .