计算,能简算的要简算
10÷0.2÷2.5 64×4.5+3.6×45 1.25×3.2×0.8
14.5×102 8.4÷0.21÷0.5 0.8×[(5﹣0.68)÷1.2].
直接写出得数
4700÷125÷8=8
+1
+1
= 0.25×0.3÷0.25×0.3=
1÷
×
=(
+
)×12=
﹣
=
计算下面各题,怎样简便就怎样计算.
884÷34+17×211.25×3.2×0.254.2﹣1.38+5.8﹣4.622÷
﹣
÷2.
直接写得数
①0.375÷
=
②13
+4.37+5.63+6
=
③777×9+111×37=
④(
+
)×15×17=
⑤
= .
用简便方法计算
①4.85×3
﹣3.6+6.15×3
②0.025×999×2.8×40÷2
③(
﹣
)×23+25÷71+15
÷23 ④9.81×0.1+0.5×98.1+0.049×981
⑤1000+999﹣998﹣997+996+995﹣994﹣993+…+104+103﹣102﹣101.
(1)2001×20022002﹣2002×20012001(2)2000﹣1+9×111×999
(3)
(4)2008﹣1+2﹣3+4﹣…+2006﹣2007.