有理数重点题解
一计算:
1. (-)++(-)++ 2. (-3)+4++(-2)+1
=++-- =4-2+1-3+
=-4 =2-2+
=- =
3.(-3)+(-4)+6+(-3) 4.| -|+(-)+|-|+||
=-3-4-3+6 =-++
=-10+6 =0+1
=-4+(-) =1
=-4+
=-3
二计算:
1. %(-)%(-11)%(-1) 2. (-3)%(-246) %(-)%
= - %%% =-%%246%
=-1% =-1%246%
=-15 = -6
3. (-) %8 - (-) %(-) 4. (-1)- (-4)%
=-%8-% =-1-(-)%
=-1- = -1 -(-2)
=- =-1+2
= 1
5. 39%(-12) 6. 15%(-+) - 24%(-)
= (40-)%(-12) =15%(-)+15%- 24%-24%(-)
= 40%(-12)- %(-12) =-9+5 – 10 +
=-480+ =-14+11
=-479 = -3+
= -2
7. 120%(3-5- 7) 另解:120% (3-5- 7)
=120%(--) =120%[3-5- (8-)]
=120%-120%-120% =120%(3-5-8)+120%-120%+120%
=456-700-965 =120%(-10)+96-100+4
=- 1200 =-12
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