+﹣+ +++4.56×0.27+483×0.0456+1.9×4.56+0.456×30 1﹣﹣﹣﹣﹣﹣﹣﹣.
简便运算.7.5+2.7+2.7+2.5+4.3 7.9﹣3.27﹣0.73+1.1 72×125(80+4)×125 67×88+67×11+67 203×15.
怎样简便怎样算:①8.35+3.8﹣2.35 ②15.4﹣(5.4+2.3) ③98×45④16×125×25 ⑤12×69﹣69×2 ⑥(20+8)×25.
用简便方法计算2011× +﹣+ (+)÷ 25%××4×.
口算题435+199= 16×0.2= 12= 4×25%= 2﹣2÷5= = = 5.5×1.6+1.6×4.5=
9﹣(+)×24.