分析:(1)、(4)小數(shù)除法,先把除數(shù)變成整數(shù),除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位,然后按照除數(shù)是整數(shù)的除法進(jìn)行計(jì)算;
(2)、(7)分?jǐn)?shù)加減法先通分,然后按著同分母分?jǐn)?shù)加減法的法則進(jìn)行計(jì)算;
(5)小數(shù)乘法,按著整數(shù)乘法的法則進(jìn)行計(jì)算,再看因數(shù)中一共有幾位小數(shù)就從積的末位起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn).
(6)利用乘法分配律2.2×(99+1)=2.2×100=220計(jì)算;
(8)分?jǐn)?shù)乘法,分子乘分子,分母乘分母,能約分的就約分;
(9)分?jǐn)?shù)除法,等于分?jǐn)?shù)乘除數(shù)的倒數(shù);
(10)小數(shù)加上百分?jǐn)?shù),把百分?jǐn)?shù)化成小數(shù)計(jì)算;
(3)整數(shù)加法138+98=138+100-2,這樣計(jì)算簡便.
解答:解:(1)7÷0.01=700,(2)1-
=
,( 3)138+98=236,(4)1.7÷2.5=0.68,
(5)0.36×10=3.6,( 6)2.2×99+2.2=220,(7)
+
=
,(8)
×21=
4,
(9)
÷
=
1,( 10)10.2+80%=11.
點(diǎn)評(píng):此題考查整數(shù)四則運(yùn)算的計(jì)算方法,要根據(jù)題中數(shù)據(jù)的特點(diǎn),并看準(zhǔn)運(yùn)算符號(hào),靈活地運(yùn)用法則進(jìn)行計(jì)算.