6-1又1/5-3.8= 8.4-(1又2/5-5/7)= 1又1/4+2.7-1.25= 3.4-(1又2/5+2/7)=
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6-1又1/5-3.8= 8.4-(1又2/5-5/7)= 1又1/4+2.7-1.25= 3.4-(1又2/5+2/7)=
6-1又1/5-3.8= 8.4-(1又2/5-5/7)= 1又1/4+2.7-1.25= 3.4-(1又2/5+2/7)=
6-1又1/5-3.8= 8.4-(1又2/5-5/7)= 1又1/4+2.7-1.25= 3.4-(1又2/5+2/7)=
第一题
原式
=6-6/5-3.8
=6-1.2-3.8
=6-(1.2+3.8)
=6-5
=1
第二题
原式
=8.4-(7/5-7/5)
=8.4-0
=8.4
第三题
原式
=1.25+2.7-1.25
=1.25-1.25+2.7
=0+2.7
=2.7
第四题
原式
=3.4-(7/5+2/7)
=3.4-(49/35+10/35)
=3.4-59/35
=34/10-59/35
=238/70-118/70
=12/7
1
54/7
27/10
12/7