几道有理数加减法的填空题.(-20)+(+3)-(-5)-(+7)=___+___+___+___=___=___;(+9)-(+10)+(-2)-(-8)+2=___+___+___+___+___=___.

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几道有理数加减法的填空题.(-20)+(+3)-(-5)-(+7)=___+___+___+___=___=___;(+9)-(+10)+(-2)-(-8)+2=___+___+___+___+___=___.

几道有理数加减法的填空题.(-20)+(+3)-(-5)-(+7)=___+___+___+___=___=___;(+9)-(+10)+(-2)-(-8)+2=___+___+___+___+___=___.
几道有理数加减法的填空题.
(-20)+(+3)-(-5)-(+7)=___+___+___+___=___=___;
(+9)-(+10)+(-2)-(-8)+2=___+___+___+___+___=___.

几道有理数加减法的填空题.(-20)+(+3)-(-5)-(+7)=___+___+___+___=___=___;(+9)-(+10)+(-2)-(-8)+2=___+___+___+___+___=___.
(-20)+(+3)+(-5)+(+7)=(-20)+(10)+(-10)+(5)=(-15)=-(+15)
(+9)-(+10)+(-2)-(-8)+2=(+9)+(+10)+(+8)+(-10)+(-10)=(+7)