口算题.×= ×= ×9= ××0=+= ×11= 5﹣﹣= ×9×7=
计算下面各题怎样算简便就怎样算:2.5×3.2×25 +++…+ ÷+×[﹣(﹣)]÷ 5000﹣27÷18×106 (﹣+)×45.
下面的题怎样简便怎样算:①(﹣÷4×)÷ ②×23 ③38﹣15.38+61.25﹣3.62④17.98+2.5×0.3﹣18÷1.5 ⑤×+× ⑥(+)÷.
用简便方法计算.1.25×32×2.58.57×1.4+85.7×0.86.
简便运算.0.25×32×12.5% 3.7×0.32+3.2×0.63 (+﹣)÷.
用简便方法计算.75﹣2. 63+5. 25﹣0.37 ×7+12×+.