Question

直接寫(xiě)出得數(shù)． 420-78=	6.25+3.75=	0.9-0.01=	2-2÷9=	2 3 × 3 10 =
1 4 + 3 5 =	2 5 ×4+6× 2 5 =	8×9×1.25=	84÷7=	70-34=
0×264+136=	0.25÷0.01=

Answer 1

分析：運(yùn)用小數(shù)及分?jǐn)?shù)的加減乘除法的計(jì)算法則進(jìn)行計(jì)算，計(jì)算時(shí)注意分?jǐn)?shù)的約分，一個(gè)非0的數(shù)除以本身商是1，0乘以任何數(shù)都得0．

解答：解：420-78=342         6.25+3.75=10         0.9-0.01=0.89              2-2÷9=1

7

9

            

2

3

×

3

10

=

1

5

，
   

1

4

+

3

5

=

17

20

        

2

5

×4+6×

2

5

=4       8×9×1.25=90              84÷7=12               70-34=36，
    0×264+136=136    0.25÷0.01=25

點(diǎn)評(píng)：本題考查了學(xué)生的計(jì)算能力及對(duì)小數(shù)和分?jǐn)?shù)的計(jì)算法則的掌握與運(yùn)用情況．