Question

8 21 × 7 16 =	2 3 ÷14=	26× 12 13 =	14 13 ÷28=
12× 4 3 =	9 8 × 8 3 =	5 8 × 1 5 =	2 3 ×24=
9 5 ÷ 3 10 =	25÷4+25× 3 4 =

Answer 1

分析：分?jǐn)?shù)乘法：分子相乘的積做分子，分母相乘的積做分母，能約分的先約分；
分?jǐn)?shù)除法：除以一個(gè)不為零的數(shù)等于乘上這個(gè)數(shù)的倒數(shù)；
25÷4+25×

3

4

先把除法變成乘法，再運(yùn)用乘法分配律簡算．

解答：解：

8 21 × 7 16 = 1 6	2 3 ÷14= 1 21	26× 12 13 =24	14 13 ÷28= 1 26
12× 4 3 =16	9 8 × 8 3 =3	5 8 × 1 5 = 1 8	2 3 ×24=16
9 5 ÷ 3 10 =6	25÷4+25× 3 4 =25．

點(diǎn)評：本題考查了簡單的運(yùn)算，要注意根據(jù)運(yùn)算法則和運(yùn)算定律快速準(zhǔn)確的得出答案．