.
用简便方法计算:(1)6.7﹣3.15﹣1.85(2)0.25×32×12.5(3).
5﹣(3.125﹣)﹣.
用简便方法计算3.5%×9.9 4.62+9.9 4×0.6+0.06×960.
计算下面各题,能简算的要简算.1.9﹣1.9×(1.9﹣1.9)0.7+3.9+4.3+6.1 .
432×99﹣56814÷4﹣(3+5÷9)51×68×78÷(17×34×13)