计算:-1+2-3+4-5+6-7+8-9+10=______.
题型:填空题难度:一般来源:不详
计算:-1+2-3+4-5+6-7+8-9+10=______. |
答案
-1+2-3+4-5+6-7+8-9+10 =-1-3-5-7-9+2+4+6+8+10 =5. 故答案为:5. |
举一反三
下列各式变形正确的是( )A.7-6+8-9=-9-6+8+7 | B.-12-5-9+1=1-5-9+12 | C.-20+2-1+4=4-2+1-20 | D.4-35+7+6=-35-6+4-7 |
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计算:1-2+3-4+5-6+7-8+…+99-100=______. |
计算: (1)-24-(10-15) (2)(-7)+(+6)-(+9)-(-4) (3)1-(-)+(-)- (4)(-4)-(-5)+(-4)-3. |
计算: (1)(-2.8)-(+1.2); (2)(-6)+(+5); (3)-(-2)-|-3|; (4)(-)-(-0.25); (5)(-0.6)+1.7+(+0.6 )+(-1.7 )+(-9 ); (6)|-2|-(-2.5)+1-|1-2|; (7)3-(-2)+(-)--(+). |
计算: (1)(-121.4)+(-78.5)-(-8)-(-121.4) (2)3-(-2)+(-)--(+). |
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