用简便方法计算①4.85×3﹣3.6+6.15×3 ②0.025×999×2.8×40÷2③（﹣）×23+25÷71+15÷23 ④9.81×0.1+0.5×98.1+0.049×981⑤1000+999﹣998﹣997+996+995﹣994﹣993+…+104+103﹣102﹣101．
直接写出得数．+=﹣= 3×=÷=+=÷= 1﹣=×=
直接写出得数．==== 2÷3====
+=﹣=×= 14÷=÷=×=÷= 6×=
直接写得数： 1﹣= 9×=÷2=÷== 1=×1.3=×=
直接写出下面各题的得数．÷=== 1.25×0.8=== 1﹣30%= 5.4÷0.3= 9﹣0.56=
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﹣3.6+6.15×3 ②0.025×999×2.8×40÷2
﹣
）×23+25÷71+15
÷23 ④9.81×0.1+0.5×98.1+0.049×981
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÷
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= 1﹣
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= 14÷
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×
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= 6×
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= 9×
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= 1
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×1.3=
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