直接写得数．
630+60= 480+120= 270﹣90= 650+170=
20+350= 47+30= 35+85= 440﹣180=
l90+60= 230+160= 710﹣220 800﹣580=
直接写得数．
630+60= 480+120= 270﹣90= 650+170=
20+350= 47+30= 35+85= 440﹣180=
l90+60= 230+160= 710﹣220 800﹣580=
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