下面各题,怎样简便就怎样算.(1)(+﹣)×12 (2)38﹣15.38+61.25﹣4.62(3)0.91÷+1.25×1.09(4)÷[+×(1﹣)].
0.4×99+0.4.
简便计算.44×25 204×15 365﹣73﹣27 (25.8+7.5)+2.5.
运用运算定律简算:(1)(+)×24 (2)+×
简算:22.7×1.25×0.8 3.91×2.8+6.09×2.8.
用简便方法计算.(1)101×67 (2)98.5﹣42.28﹣7.72 (3)1.38+14.7+8.62+5.3 (4)3200÷4÷25.