Question

【題目】計(jì)算：

3÷ =	÷10=	÷ =	﹣ =
18× =	÷ =	÷（1﹣ × ）	×[ ÷（ + ）]
（ ﹣ × ）÷	+ × ×	9× + ÷	（ + ）×8+ ．

Answer 1

【答案】解：
①3÷ =3× =14
② ÷10= × =
③ ÷ = × =
④ ﹣ = ﹣ =
⑤18× =3
⑥ ÷ = × =
⑦ ÷（1﹣ × ）
= ÷（1﹣ ）
= ÷
= ×
=
⑧ ×[ ÷（ + ）]
= ×[ ÷ ]
= ×[ × ]
= ×
=
⑨（ ﹣ × ）÷
=（ ﹣ ）÷
= ÷
= ×
=
⑩ + × ×
= +
= +
=
=
9× + ÷
=9× + ×9
= ×（9+9）
= ×18
=15
（ + ）×8+
= ×8+ ×8+
=3+ +
=3+（ + ）
=3+
=3+1
=4
【解析】①②③④⑤⑥根據(jù)分?jǐn)?shù)加減乘除法的計(jì)算方法解答；⑦⑧⑨⑩根據(jù)分?jǐn)?shù)四則混合運(yùn)算的法則解答；先將分?jǐn)?shù)除法轉(zhuǎn)化成分?jǐn)?shù)乘法，再根據(jù)乘法分配律進(jìn)行簡算；根據(jù)乘法分配律和加法結(jié)合律進(jìn)行簡算．進(jìn)行分?jǐn)?shù)的四則運(yùn)算及四則混合運(yùn)算時，要注意數(shù)據(jù)特點(diǎn)和運(yùn)算符號，注意運(yùn)算順序，能運(yùn)用運(yùn)算定律和性質(zhì)進(jìn)行簡算的要簡算．