Question

计算一道题

[1/3+(20/9-28/15)×35/12]×31/15

Answer 1

[1/3+(20/9-28/15)×35/12]×31/15
=[1/3 + (20x5/9x5-28x3/15x3)x35/12]x31/15
=[1/3 + (100-84)/(15x3) x35/12]x31/15
=[1/3 + 16x35/(15x3x12)]x31/15
=[1/3 + 4x7/(3x3x3)]x31/15
=[1/3 + 28/27]x31/15
=(28+9)/27x31/15
=37x31/(27x15)
=1147/405
=2.832098765

Answer 2

2.8320987
[1/3+(100-84)/45X35/12]X31/15
=(1/3+28/27)X31/15
=(9/27+28/27)X31/15
=37/27X(31/15)
=1147/405
≈2.83

Answer 3

[1/3+(20/9-28/15)×35/12]×31/15
=(1/3+(100-84)/45 ×35/12)×31/15
=(9/27+28/27)×31/15
=37/27×31/15
=1147/405