用用交换律和结合律来做比较简便。
解:6/7+1/6-(3/8-1/7)等于( 19/24 )
∵已知需求出6/7+1/6-(3/8-1/7)等于多少
X - (Y - Z)= X - Y + Z
∴6/7 + 1/6 -(3/8 - 1/7)
= 6/7 + 1/6 - 3/8 + 1/7
= (6/7 + 1/7)+ 1/6 - 3/8
= 7/7 + 1/6 - 3/8
= 1 + 1/6 - 3/8
= 24/24 + (1×4)/(6×4)- (3×3)/(8×3)
= 24/24 + 4/24 - 9/24
= 28/24 - 9/24
= (28-9)/24
= 19/24
答:6/7+1/6-(3/8-1/7)等于19/24
你好
=6/7+1/6-3/8+1/7
=6/7+1/7+1/6-3/8
=1+4/24-9/24
=1-5/24
=19/24