Question

3/4-2/7 （-1/6）-（-2/3）-1

亲们怎么做

Answer 1

3/4 - (2/7) (-1/6) -(-2/3) - 1
= 3/4 + 1/21 + 2/3 - 1
= 1/21 + 2/3 - 1 + 3/4
= 5/7 - 1/4 = (20-7)/28
= 13/28

Answer 2

3/4-2/7-1/6+2/3-1
=（3*3-1*2+2*4）/12-2/7-1通分12
=15/12-1-2/7
=3/12-2/7
=1/4-2/7 通分28
=7/28-2*4/28
=-1/28

Answer 3

3/4 - (2/7) (-1/6) -(-2/3) - 1
= 3/4 + 1/21 + 2/3 - 1
= 1/21 + 2/3 - 1 + 3/4
= 5/7 - 1/4 = (20-7)/28 = 13/28

Answer 4

3/4-2/7（-1/6）-（-2/3）-1
=3/4+1/21+2/3-1
=3/4+（1+2x7）/21-1
=3/4+15/21-1
=3/4+5/7-1
=（3x7+5x4-28）/28
=13/28

Answer 5

3/4-2/7（-1/6）-（-2/3）-1
=3/4+1/21+2/3-1
=3/4+15/21-1
=63/84+60/84-1
=123/84-1
=39/84
=13/28