Question

直接寫出得數(shù)

20÷2%=	5.3+2.67=	17 7 ×7=	2 5 +0.47=
2 3 + 2 3 ÷ 2 3 + 2 3 =	1.7×9+1.7=	6 5 ÷ 5 6 =	1.02-0.43=

Answer 1

分析：①把百分?jǐn)?shù)化為小數(shù)，再計(jì)算；②⑧注意小數(shù)點(diǎn)對(duì)齊；③注意約分；④把分?jǐn)?shù)化為小數(shù)，再計(jì)算；⑤先算除法，再算加法；⑥運(yùn)用乘法分配律簡(jiǎn)算；⑦把除法改為乘法，再計(jì)算．

解答：解：①20÷2%=1000；           ②5.3+2.67=7.97；           ③

17

7

×7=17；          ④

2

5

+0.47=0.87；
⑤

2

3

+

2

3

÷

2

3

+

2

3

=2

1

3

；           ⑥1.7×9+1.7=17；           ⑦

6

5

÷

5

6

=

36

25

；           ⑧1.02-0.43=0.59．

點(diǎn)評(píng)：此題考查了小數(shù)、分?jǐn)?shù)、百分?jǐn)?shù)的計(jì)算，注意數(shù)字轉(zhuǎn)化、小數(shù)點(diǎn)對(duì)齊、約分等知識(shí)．