口算题.0.75×2= 0.42×0.2= 2.5×0.4= 40×1.3= 0.07×8=1.2×0.4= 0.08×0.5= 1.25×8= 0.03×3.1= 1.3×5=
根据加法、乘法运算定律,在□中填上合适的数 □+571=□+259.
301+718+699+182.
用简便方法计算. 6.45×1020.47×0.5×0.80.46×1.9+0.54×1.9 0.027+9.9×0.2715.8×69.3﹣68.3×15.81.25×32×2.5.
怎样简便就怎样计算 63+152+137+148=102×99=645﹣180﹣245= 382×101﹣382=125×24=35×8+35×6﹣4×35= 1280÷16÷4=890﹣147﹣53=32×25×125=
(13+13×2+13)×25.