快快快!數學!20分呀f.1數

1又4/7除(7又3/7減6又4/5)減3又4/7除7又1/2

=11/7除(52/7-34/5)-24/7除15/2
=11/7除[(260-245)/35]-24/7除15/2
=11/7除15/35-24/7除15/2
=11/7乘35/15-24/7乘2/15
=55/15-48/105
=385/105-48/105
=337/105
=3又22/105

1又4/7除(7又3/7減6又4/5)減3又4/7除7又1/2
= 11/7除(52/7-34/5)-25/7除15/2
= 11/7除(260/35-238/35)-25/7除15/2
= 11/7除22/35-25/7除15/2
= 11/7 * 35/22 - 25/7 * 2/15
= 5/2 – 10/21
= 105/42 – 20/42
= 85/42
= 2/又/42

1又4/7除(7又3/7減6又4/5)-3又4/7除7又1/2
=11/7除(6又10/7-6又4/5)-25/7除15/2
=11/7除(6又50/35-6又28/35)-25/7乘2/15
=11/7除22/35-10/21
=11/7乘35/22-10/21
=5/2-10/21
=105/42-20/42
=85/42
=2又1/42

1又4/7除(7又3/7減6又4/5)-3又4/7除7又1/2
=11/7除(6又10/7-6又4/5)-25/7除15/2
=11/7除(6又50/35-6又28/35)-25/7乘2/15
=11/7除22/35-10/21
=11/7乘35/22-10/21
=5/2-10/21
=105/42-20/42
=85/42
=2又1/42

1又4/7除(7又3/7減6又4/5)-3又4/7除7又1/2
=11/7除(6又10/7-6又4/5)-25/7除15/2
=11/7除(6又50/35-6又28/35)-25/7乘2/15
=11/7除22/35-10/21
=11/7乘35/22-10/21
=5/2-10/21
=105/42-20/42
=85/42
=2 1/42

*hope this can help u la!~

=11/7 除 ( 52/7 - 34/5 )* - 25/7 除 15/2
=11/7 除 ( 260/35 - 238/35 ) - 25/7 X 2/15^
=11/7 除 22/35 - 10/21
=11/7 X 35/22 -10/21
=35/14 - 10/21
=105/42 - 20/42
=85/42

*要通份
^除变乘,分子和分母要上下调换

1又4/7除(7又3/7減6又4/5)減3又4/7除7又1/2
= 11/7除(52/7減34/5)減25/7除15/2
= 11/7 除(260/35減238/35)減 25/7 x 2/15
= 11/7 除 22/35 減 10/21
= 11/7 x 35/22 減 10/21
= 5/2 減 10/21
= 105/42 減 20/42
= 85/42
= 2又1/42

先做括號
通分母5,7LCM 35
(7又3/7減6又4/5)= 7又15/35-6又28/35 =6又50/35-6又28/35=22/35

1又4/7除(7又3/7減6又4/5)減3又4/7除7又1/2
= 11/7除22/35 -25/7X2/15
=11/7 X 35/22 - 10/21
= 5/2 - 10/21
= 105/42 - 20/42
= 85/42
= 2 又 1/42

=1又4/7除(52/7-34/5)-3又4/7除7又1/2
=1又4/7除(260-238/35)-3又4/7除7又1/2
=1又4/7x35/22-3又4/7除7又1/2
=11/7x35/22-25/7x2/15
=5/2-5/7x2/3
=5/2-10/21<-(唔知岩唔岩)
=答案自己答