400÷50= 40×80= 620÷20= 18×5+4= 19×30=4800÷400= 6400÷80= 3×25×4= 560÷70= 28×400=405×20= 125×5×8=
计算下列各题,能简算的要简算.25%×63+37× 101×﹣ 375﹣448÷8×5[75×(6.9﹣3.72)]÷0.6 (+﹣)×36 +(+)÷.
(1):x=2:1.8 (2)[(1.4+1.6×2)×(1÷﹣2.375)]+2.901(3)2007×20082008﹣2008×20072007 (4)++++…+.
下面各题,怎样算简便就怎样算.1080+270÷18﹣864 7.54++2.46+ (2.4﹣)÷0.625+2.5×12.5×40×0.8 6﹣÷﹣ .
下面各题,怎样简便就怎样算.19.98×37﹣199.8×1.9+1998×0.82 9999×7+1111×37[﹣(﹣)]× (70+)×.
脱式计算.0.6+32×0.25﹣6 ÷[(+)×] 1.05×(3.8﹣0.8)÷6.3 +×99+.