直接写出得数． 510+240= 3﹣1.06= 2.4×5= =12.56÷3.14= = = =
直接写出得数． 6.4﹣4= = 0.25×12== = 4.8÷0.1== =
直接写出得数．0.83+0.27= 2.9×100= 50÷1000= ×10=0.7 80÷ =0.8 +=5.6+4= 0.13×1000= ﹣0.35=
直接写出得数．+= ﹣+= += ﹣= +=+= ++= ﹣= += 3﹣﹣=
直接写出得数﹣= ﹣= ﹣= +=+= ﹣= += ﹣=
直接写出得数．+= ﹣= += ﹣=10﹣﹣= = = ==．
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