能简算的要简算．8.37×0.2+8.37×2.8 0.98×101 2.8×0.25+0.75 17.23﹣4.81﹣5.19．
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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