5/7+(4/3-4/9)=
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5/7+(4/3-4/9)= 101/63
咨询记录 · 回答于2023-03-08
5/7+(4/3-4/9)=
5/7+(4/3-4/9)= 101/63
5/7+(4/3-4/9)=5/7+(12/9-4/9)=5/7+8/9=45/63+56/63=101/63
详细问题
先算小括号里面的,进行通分,3分之4通分乘9分之12
1/4-(3/8-1/4)
1/4-(3/8-1/4)=1/4-(3/8-2/8)=1/4-1/8=1/8
7/24-(3/4-1/6)
7/24-(3/4-1/6)=7/24-(18/24- 4/24)=7/24- 14/24=- 7/24=
5/7(21/10-3/7)
少加了符号
5/7-(21/10-3/7)
5/7-(21/10-3/7)=50/70- (147/70- 30/70)=50/70-117/70=-67/70