用简便方法计算.355+260+140+245 987﹣(287+135)89×99+89 1050÷15÷7.
脱式计算,能简便的要用简便方法计算.0.36×1.5×0.4 0.05×3.2×40 26×15.7+15.7×743.78×0.5﹣0.65 3.98+13.4×0.24 (9.37+9.37+9.37+9.37)×2.5.
能简算的要用简便方法计算24.1×1.5+7.59×15 (3.7+17×0.4)÷3.5 75.36÷12﹣4.32×0.58.8×0.125 7.6×5.3+3.7×7.6 6.6÷(0.68+0.42)
脱式计算.(能简算的要简算)(1)1.25×8.37×0.8 (2)(9﹣2.35)×0.64 (3)0.25×32×12.5(4)0.15×1999+0.15 (5)0.37×1.4﹣0.4×0.37 (6)8.7×9.9.
递等式计算(能简算的要简算).(1)191.3﹣47.2+96.9(2)9.63+13.78﹣3.63(3)50.03﹣6.5﹣0.5(4)25×125×16(5)2506﹣506×3+27(6)99×63+63.
计算下列各题,能简算的要简算.2.56÷0.04÷0.5 1.92÷0.12﹣2. 37.3﹣1.5÷0.24 7.52×0.65÷0.752.