口算.8÷5= 0.72÷0.8= 0.25÷0.5= 0.5÷4=1.25×10= 0.5÷2= 0×l0.5= 0.8×12.5=0.4×0.7= 3÷1.5= 1.6÷0.04= 0÷2.1=
巧算:4.65×320+46.5×68.
用简便方法计算,写出简算的过程. 266+(198+34)601﹣199﹣201252﹣198.
简算: 0.25×4.78×40.65×2011.2×2.5+0.8×2.5 4.8×0.256.53÷0.4÷2.51.8×20.1.
简便计算 536﹣1980.75×5.3+4.7×0.751﹣+﹣.
脱式计算,能简算的要简算. (1)0.95××0.95 (2) (3)10000÷25÷8÷4 (4)﹣1.625﹣2.375+3.