[2/5+0.6=1, 4+3%=4.03, 2.15-(1.15-0.15)=1.15, 49
7
8÷7=7
1
8],
50%×(2.9-2.7)=0.1, [1/4×
1
5÷
1
4×
1
5]=[1/25], 1÷[1/3]-[1/3]÷1=2[2/3], [5/7×
21
35]=[3/7],
[1/10×
1
10×10=
1
10], [1/5]×([2/3+
1
2])=[7/30], [3/4+
5
6]=[19/12], 2-150%=0.5.
[2/5+0.6=1, 4+3%=4.03, 2.15-(1.15-0.15)=1.15, 49
7
8÷7=7
1
8],
50%×(2.9-2.7)=0.1, [1/4×
1
5÷
1
4×
1
5]=[1/25], 1÷[1/3]-[1/3]÷1=2[2/3], [5/7×
21
35]=[3/7],
[1/10×
1
10×10=
1
10], [1/5]×([2/3+
1
2])=[7/30], [3/4+
5
6]=[19/12], 2-150%=0.5.