求:-4.2+5.7-8.4+10 -1/4+5/6+2/3-1/2 12-(-18)+(-7)-15 4.7-(-8.9)-7.5+(-6)的简便算法!
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![求:-4.2+5.7-8.4+10 -1/4+5/6+2/3-1/2 12-(-18)+(-7)-15 4.7-(-8.9)-7.5+(-6)的简便算法!](/uploads/image/z/593613-45-3.jpg?t=%E6%B1%82%EF%BC%9A-4.2%2B5.7-8.4%2B10+-1%2F4%2B5%2F6%2B2%2F3-1%2F2+12-%EF%BC%88-18%EF%BC%89%2B%EF%BC%88-7%EF%BC%89-15+4.7-%EF%BC%88-8.9%EF%BC%89-7.5%2B%EF%BC%88-6%EF%BC%89%E7%9A%84%E7%AE%80%E4%BE%BF%E7%AE%97%E6%B3%95%21)
求:-4.2+5.7-8.4+10 -1/4+5/6+2/3-1/2 12-(-18)+(-7)-15 4.7-(-8.9)-7.5+(-6)的简便算法!
求:-4.2+5.7-8.4+10 -1/4+5/6+2/3-1/2 12-(-18)+(-7)-15 4.7-(-8.9)-7.5+(-6)的简便算法!
求:-4.2+5.7-8.4+10 -1/4+5/6+2/3-1/2 12-(-18)+(-7)-15 4.7-(-8.9)-7.5+(-6)的简便算法!
-4.2+5.7-8.4+10
=5.7-4.2+10-8.4
=1.5+1.6
=3.1
-1/4+5/6+2/3-1/2
=5/6+4/6-1/4-1/2
=9/12-3/4
=3/4-3/4
=0
12-(-18)+(-7)-15
=12-7+18-15
=5+3
=8
4.7-(-8.9)-7.5+(-6)
=4.7+8.9-7.5-6
=4.7+1.4-6
=6.1-6
=0.1