解:
①100000÷32÷125÷25,
=100000÷(32×125×25),
=100000÷(4×8×125×25),
=100000÷[(8×125)×(4×25)],
=100000÷[1000×100],
=100000÷100000,
=1;
②199999+19999+1999+199+19,
=(199999+1)+(19999+1)+(1999+1)+(199+1)+(19+1)-5,
=200000+20000+2000+200+20-5,
=222220-5,
=222215;
③200.8×7.3-63×20.08,
=20.08×73-63×20.08,
=20.08×(73-63),
=20.08×10,
=200.8;
④888888×88888,
=888888×(80000+8000+800+80+8),
=71111040000+7111104000+711110400+71111040+7111104,
=79011476544;
⑤
+
+
+…+
+
,
=1-
+
-
+
-
+…+
-
+
-
,
=1-
,
=
;
⑥
,
=
,
=
,
=
,
=1.
分析:①根據(jù)連除的性質(zhì)進行計算;
②根據(jù)整數(shù)加法湊整法進行計算;
③根據(jù)乘法分配律進行計算;
④根據(jù)乘法分配律進行計算;
⑤根據(jù)分數(shù)的拆項進行計算;
⑥把分母根據(jù)乘法分配律進行計算,然后再約分即可.
點評:根據(jù)題意,找準巧算所運用的方法和運算定律,然后再進一步計算即可.