直接写得数．
999+14=             10﹣7.6=          6.6+1.44=          3.14×0.9=
0.63÷9=            8×0.5%=          1.5×=            0.625÷=
﹣=              1÷+=          0.4﹣=            1÷﹣÷1=
0.5²﹣0.4²=          20³=              ×40≈           4995÷249.9≈