有理数的加减运算-1/3+15.5+(-2/3) -11.5+4.5 1/7-2/5 4.7-3.4-(-3/4)

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有理数的加减运算-1/3+15.5+(-2/3) -11.5+4.5 1/7-2/5 4.7-3.4-(-3/4)

有理数的加减运算-1/3+15.5+(-2/3) -11.5+4.5 1/7-2/5 4.7-3.4-(-3/4)
有理数的加减运算
-1/3+15.5+(-2/3) -11.5+4.5 1/7-2/5 4.7-3.4-(-3/4)

有理数的加减运算-1/3+15.5+(-2/3) -11.5+4.5 1/7-2/5 4.7-3.4-(-3/4)
-1/3+15.5+(-2/3)
=-1/3-2/3+15.5
=-(1/3+2/3)+15.5
=-1+15.5
=15.5-1
=14.5
-11.5+4.5
=-(11.5-4.5)
=-7
1/7-2/5
=5/35-14/35
=-(14/35-5/35)
=-9/35
4.7-3.4-(-3/4)
=4.7-3.4+3/4
=1.3+0.75
=2.05