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1、有理数加减法口算百题2-3=0-(-1)=+9-6=(-34)+(+89)=-21-(+4)=70-90=-5+ (+6) =1-89=(+56)- (+73) =12- (+9)=- (-6)+8=20+(+7)=(-12)-(-9)=-6+9=+3-(-54)=- 3+(+7)=9-(-1/4)=3.2-8=66-88=-66-(+88)=- 66+88=(-36)-7=(-36)-(-7)=(-36)+(+7)= I -2 I +(-4)=- (+7)-(+8)=+9- (-7) =+9- (+7) =-2- (+9) =15- (-8)=- 2- (-9) =-2+ (+9) =-2+
2、9=-81+29=23-35=-4+6=- 3-4=8/9-16/15=-3/4+2=-1.2+(-2/3)=-1 + (+1.2)=I -72 | -(-2)=+5-(-6)=I -9+3 I =-(+5)-(+8)=- 3+( 尸-7| -6 I + ( 尸-9()+(-30) =-40() -30=40I - 3 I + (-3) =-6+ ()=-9-6-()=-9-12= () + (-5)2/9-(+5)=+7+ () =-2-3.2+ (+1/3)=()-7=-27(-35)-(+35)=+35-(-35)=-2 -(-4) =-6 - I -3 1 =- 25- (+26) =
3、-5-6=+8+(-5) =-8-9=-2-(-5)=-78+6=- 78+ (+6) =-78+(-6) =-78-(+6) =8-90=- 78- (-6) =+78+ (+6) =+78+ (-6) =+78-(+6)=+78-(-6)=- 9+7=78-6=78-(-6)=4-()=-14-()=1()-4=-1()-(-4)=18-(-40)=1-(-2)=2-5=- 3.6-4=-3.6-(-4)=3.6-(-4)=- 9.2-() =-2.6+2.3- () =5.4- 1 -3 1 +(-3)=-22- I -3 1 =8-(-12) =8- (+12)=8+(-12)=- 30+67=-4.5+2.7=-8-14=+7-2=-7-2=1-2+3-4=()+(-4)=-140-()=-1-2-5=-2+5=-3.6+(-4)=+3.6-(-4) =+3.6+(+4)=-2.3- ()=-5.4 |-3 1 + 1-3 1 =1 -3 1 +(-3.1)=(-6)- 1-31=8-12=-8-(-12)=-8-(+12) =30-67=-8+(-14)=(-8)-(-14)=2-7=-1+2-3+4=8+ (-30) - (-6)=-2-3-5-6=+7)+(+5)+(+2)=+6-(+2)- (-9) + (-4)=