1/2+(-2/3)-(-4/5)+(-1/2)
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1/2+(-2/3)-(-4/5)+(-1/2)
1/2+(-2/3)-(-4/5)+(-1/2)
1/2+(-2/3)-(-4/5)+(-1/2)
1/2-2/3+4/5-1/2
=4/5-2/3
=2/15
十五分之二
4/30
2/15
=2//5
(1) (2) (3) (4) (5)
1)2)3)4)5)
1) 2) 3) 4) 5)
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)-(-5/3)
4×(-1/2²)-3/2×(-2/5)
-1-(-2)-(+3)+(-4)-(-5)
1/2+(-2/3)-(-4/5)+(-1/2)-(+1/3)
5/9+(3/4-1/2)
4/5+(3/8-1/2)
(2*3*4*5)*(1/2-1/3-1/4-1/5)
(2/3-4/5+1/2)÷(-15)
2/3,1,6/5,4/3,( ),3/2
(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/100+.99/100)=
(1-2)(1-3)(3-4)(4-5)...(19-20)=
(5/2-2/3+1/4)*2/11是多少
1 2 2 4 3 8 4 16 5 ()
1,2,2,4,3,8,4,16,5,( )
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)