tính bằng hai cách (2/3×4/5)×5/6

Đáp án:

`a]` `93/40`

`b]` `9/10`

Giải thích các bước giải:

`a]` `4/5÷2/3+3/4÷2/3`

`C1:`

`4/5÷2/3+3/4÷2/3`

`=4/5×3/2+3/4×3/2`

`=6/5+9/8`

`=93/40`

`C2:`

`4/5÷2/3+3/4÷2/3`

`=4/5×3/2+3/4×3/2`

`=[4/5+3/4]×3/2`

`=31/20×3/2`

`=93/40`

-

`b]` `7/3×3/5-5/6×3/5`

`C1:`

`7/3×3/5-5/6×3/5`

`=7/5-1/2`

`=9/10`

`C2:`

`7/3×3/5-5/6×3/5`

`=[7/3-5/6]×3/5`

`=3/2×3/5`

`=9/10`

Đáp án:

Giải thích các bước giải:

a]4/5:2/3+3/4:2/3

c1 : 4/5*3/2 + 3/ 4 * 3/2

= 6/5 +9/8

= 93/ 4

c2 : 4/5:2/3+3/4:2/3

= 2/3 . [ 4/5 +3/4 ]

= 2/3 . 31/20

= 93 / 4

b]7/3×3/5-5/6×3/5

c1=7/5-1/2

= 9/10

c2=7/3×3/5-5/6×3/5

=3/5 . [7/3 5/6 ]

=3/5 . 3/2

=9/10