Question

口算，在題目后面直接寫出得數(shù)． 3 4 × 5 9 × 3 10 =	3 5 ÷6× 10 5 =	7 12 ÷7÷ 5 6 =
1- 1 6 - 5 6 =	8 9 + 4 5 - 8 9 =	1 6 + 3 4 + 1 3 =
3 13 ×25+ 3 13 =	1÷ 1 2 +0.1=	36× 5 8 - 5 8 ×4=

Answer 1

考點：分?jǐn)?shù)的四則混合運算

專題：運算順序及法則

分析：①約分計算；②③把除法變?yōu)槌朔�，約分計算；④運用減法的性質(zhì)簡算；⑤運用加法交換律與結(jié)合律簡算；⑥通分計算；⑦⑨運用乘法分配律簡算；⑧先算除法，再算加法．

解答：

解： 3 4 × 5 9 × 3 10 = 1 8	3 5 ÷6× 10 5 = 1 5	7 12 ÷7÷ 5 6 = 1 10
1- 1 6 - 5 6 =0	8 9 + 4 5 - 8 9 = 4 5	1 6 + 3 4 + 1 3 = 5 4
3 13 ×25+ 3 13 =6	1÷ 1 2 +0.1=2.1	36× 5 8 - 5 8 ×4=20

點評：此題考查了分?jǐn)?shù)的四則混合運算，要注意分析式中數(shù)據(jù)，運用合適的簡便方法計算．