计算下面各题.三克油,有些麻烦你打.(1)12-21 (2)(-1.7)-(-2.5)(3)3分之2-(-2分之1) (4)(-6分之1)-(-3分之1)
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![计算下面各题.三克油,有些麻烦你打.(1)12-21 (2)(-1.7)-(-2.5)(3)3分之2-(-2分之1) (4)(-6分之1)-(-3分之1)](/uploads/image/z/2736139-67-9.jpg?t=%E8%AE%A1%E7%AE%97%E4%B8%8B%E9%9D%A2%E5%90%84%E9%A2%98.%E4%B8%89%E5%85%8B%E6%B2%B9%2C%E6%9C%89%E4%BA%9B%E9%BA%BB%E7%83%A6%E4%BD%A0%E6%89%93.%281%2912%EF%BC%8D21+%282%29%28%EF%BC%8D1.7%29%EF%BC%8D%28%EF%BC%8D2.5%29%283%293%E5%88%86%E4%B9%8B2%EF%BC%8D%28%EF%BC%8D2%E5%88%86%E4%B9%8B1%29+%284%29%28%EF%BC%8D6%E5%88%86%E4%B9%8B1%29%EF%BC%8D%28%EF%BC%8D3%E5%88%86%E4%B9%8B1%29)
计算下面各题.三克油,有些麻烦你打.(1)12-21 (2)(-1.7)-(-2.5)(3)3分之2-(-2分之1) (4)(-6分之1)-(-3分之1)
计算下面各题.三克油,有些麻烦你打.
(1)12-21 (2)(-1.7)-(-2.5)
(3)3分之2-(-2分之1) (4)(-6分之1)-(-3分之1)
计算下面各题.三克油,有些麻烦你打.(1)12-21 (2)(-1.7)-(-2.5)(3)3分之2-(-2分之1) (4)(-6分之1)-(-3分之1)
(1)12-21
= -21+12
= -9
(2)(-1.7)-(-2.5)
= -1.7+2.5
= 2.5-1.7
= 0.8
(3)3分之2-(-2分之1)
= 3分之2+2分之1
= 6分之4+6分之3
= 6分之7
(4)(-6分之1)-(-3分之1)
= -6分之1+3分之1
=3分之1-6分之1
=6分之2-6分之1
=6分之1
(1)12-21
= -9
(2)(-1.7)-(-2.5)
= -1.7+2.5
=0.8
(3)3分之2-(-2分之1)
= 3分之2 + 2分之1
= 1又6分之1
(4)(-6分之1)-(-3分之1)
= -6分之1+ 3分之1
= 6分之1
计算下面各题。谢谢,要过程。
(1)12-21=-9
(2)(-1.7)-(-2.5)=-1.7+2.5=0.8
(3)3分之2-(-2分之1) =2/3+1/2=1又1/6
(4)(-6分之1)-(-3分之1)=-1/6+1/3=1/6