(1) (-3)-( )=1 (2) ()-7=-2(3) -5-()=0
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(1) (-3)-( )=1 (2) ()-7=-2(3) -5-()=0
(1) (-3)-( )=1 (2) ()-7=-2
(3) -5-()=0
(1) (-3)-( )=1 (2) ()-7=-2(3) -5-()=0
-4 、5、5
(1):-2
(2):5
(3):-5
(-2)-(-3)=-1
(-1)+(-2)= - 3 对吗
2*()=1/4/()=5*()=1/3*()=()
(1) (-3)-( )=1 (2) ()-7=-2(3) -5-()=0
计算:(+1)+(-2)+(+3)+(-4)+.+(+999)+(-100)=( ) 要求:
1/2×( )=( )×18/7=1×( )=3×( )=1
(1/7)*() =(1/9)*()=(1/3)/()=(2/5)+()=()-(1/4)
)+1=()-3=()+3=()-2=8-()=()-4=()
(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×...×(1+1/99)×(1-1/99)=?
(1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×……×(1+1/99)×(1-1/99)=
(1)+(-2)+(+3)+(-4)=.+(+2009)+(-2019)=?
(1-2)(1-3)(3-4)(4-5)...(19-20)=
(1×2×3×…×2005)×(-1/2)×(-1/3)×(-1/4)×...×(-1/2005)=?
(1) 1+(-2)+3+(-4)+5+(-6)+.+99+(-100)=?(2)(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=?
填时间量词3()+7()=1() 5()+2()=1() 5()+19()=1() 4()+8()=1()
数列 1+(1+2)+(1+2+3)+(1+2+3+4)+.+(1+2+3+...+2009)=?
(2-3)-(5*7-8)+11-(9-6-4)*(3+1)= (1/2-3)*(1-1/2-1/3)*(-1-1/2)*(-4)*(-2-1/3)-(-4)*(-1/8)*(2-1-1/3)*(2-1-1/3)*(2+1/3-1/2)=有负数和绝对值感激不尽
化简下列各数:(1)-(-2 1/3)=?(2)-(+5)=?(3)-(-0.25)=?(4)+(-1/3)=?(5)-【(-1)】=?(6)-【-(+2)】=?