有理数的加减法..我就是想看看我对了没..(1)(-10)+(+6)(2)(+12)+(-4)(3)(-5)+(-7)(4)(+6)+(-9)(5)(-0.9)+(-2.7)(6)2/5+(-3/5)(7)(-1/3)+2/5(8)(-3又1/4)+(-1

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有理数的加减法..我就是想看看我对了没..(1)(-10)+(+6)(2)(+12)+(-4)(3)(-5)+(-7)(4)(+6)+(-9)(5)(-0.9)+(-2.7)(6)2/5+(-3/5)(7)(-1/3)+2/5(8)(-3又1/4)+(-1

有理数的加减法..我就是想看看我对了没..(1)(-10)+(+6)(2)(+12)+(-4)(3)(-5)+(-7)(4)(+6)+(-9)(5)(-0.9)+(-2.7)(6)2/5+(-3/5)(7)(-1/3)+2/5(8)(-3又1/4)+(-1
有理数的加减法..我就是想看看我对了没..
(1)(-10)+(+6)
(2)(+12)+(-4)
(3)(-5)+(-7)
(4)(+6)+(-9)
(5)(-0.9)+(-2.7)
(6)2/5+(-3/5)
(7)(-1/3)+2/5
(8)(-3又1/4)+(-1又1/12)

有理数的加减法..我就是想看看我对了没..(1)(-10)+(+6)(2)(+12)+(-4)(3)(-5)+(-7)(4)(+6)+(-9)(5)(-0.9)+(-2.7)(6)2/5+(-3/5)(7)(-1/3)+2/5(8)(-3又1/4)+(-1
(1)(-10)+(+6)=-10+6=-4
(2)(+12)+(-4)=12-4=8
(3)(-5)+(-7)=-5-7=-12
(4)(+6)+(-9)=6-9=-3
(5)(-0.9)+(-2.7)=-0.9-2.7=-3.6
(6)2/5+(-3/5)=2/5-3/5=-1/5
(7)(-1/3)+2/5=-1/3+2/5=-5/15+6/15=1/15
(8)(-3又1/4)+(-1又1/12)=-3-1/4-1-1/12=-4-3/12-1/12=-4-4/12=-4又3分之1

+16‘’‘’‘’