求面积.
用简便方法计算 89+124+11+76125×64975﹣147﹣23 3000÷125÷8134×8+8×66365×99.
把算式写完整. 327+915 =327+ + + = + + = + = 705﹣398 =705﹣ + = + = .
163×39﹣163×29.
699+736+101+364.
怎样简便就怎样算:××2442×(﹣)(+)××﹣×.