直接写得数．
698+560=          1200﹣909=          1.3+0.41=         500÷5÷20=
2.7﹣1.58=        2.5×0.4=           1.4÷3.5=         3.65+0.36×0=
452.4÷48.9≈     201.2×39≈         =           =
1.65+0.8=         3.6﹣0.36=          1÷=             8.4+99×8.4=
=           =              =           =