Question

20. tính giá trị biểu thức a) 8,5 x (1,32 + 3,84) - 0,8 b) 2/3 + 3/4 : 3

Answer 1

a: \(=8.5\cdot5.16-0.8=43.86-0.8=43.06\)

b: =2/3+1/4=8/12+3/12=11/12

Answer 2

` 8,5 xx (1,32 + 3,84) - 0,8`

` = 8,5 xx 5,16 - 0,8`

` = 43,86 - 0,8`

` = 43.06`

 

`2/3 + 3/4 : 3`

` = 2/3 + 3/4 xx 1/3`

` = 2/3 + (3xx1)/(4xx3)`

` = 2/3 + 1/4`

` = 8/12 + 3/12`

` = 11/12`

Answer 3

`a// 8,5xx(1,32+3,84)-0,8`

`=8,5xx5,16-0,8`

`=43,86-0,8=43,06`

`b// 2/3+3/4:3=2/3+3/4xx1/3=2/3+1/4=8/12+3/12=11/12`

Answer 4

 

 

Answer 5

`a)8,5 xx (1,32 + 3,84)`

`= 8,5 xx 5,16`

`=43,86`

 

`b)2/3+3/4:3`

`=2/3+3/4xx1/3`

`=2/3+1/4`

`=(2xx4)/(3xx4)+(1xx3)/(4xx3)`

`=8/12+3/12`

`=11/12`