口算.0.9×0.4= 31.4+6= 0.64÷4= ﹣= ÷=×= ﹣= ÷4= ++= 1﹣﹣=
简算.2400÷2595000÷1257296﹣673﹣327.
用简便方法计算.(1)4×0.8×2.5×12.5(2)(6.4×12.5×0.5)÷(1.6×2.5×0.2)(3)7.46×36+74.6×6.4.
计算:9999×2222+3333×3334 96%×25+0.75+0.25 6666×8888÷(4444×3333)
简便计算125×64﹣24×64﹣64 19+21+23+…+49+51(25+19)×4 99999×26+33333×2225×125×32 102×889000÷25÷4 99×46.
简算:3.14×99 19.25﹣0.47﹣8.53 1.25×0.03×8 720÷45.