直接写得数．4.8+5.5=，+=，100﹣23.5=，++1=，0.35+0.75=2.8﹣0.16﹣0.84=6.5×0.1=
怎样算简便就怎样算． ①= ②= ③= ④= ．
直接写出得数．+=﹣=﹣= 1﹣=﹣=+=
计算下列各题，能简算的要简算．．
直接写得数．+= 43×200= 1﹣= 350+50= 630÷7= 15×6÷9=+= 45﹣9×5=
直接写出得数﹣=﹣=+=+= 1﹣﹣=+=﹣=+=
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