超简单的计算题3又2分之1乘负七分之五减去负七分之五乘2又二分之一减去负二分之一除以五分之七?把步骤写上..白给分的题..
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![超简单的计算题3又2分之1乘负七分之五减去负七分之五乘2又二分之一减去负二分之一除以五分之七?把步骤写上..白给分的题..](/uploads/image/z/1058103-63-3.jpg?t=%E8%B6%85%E7%AE%80%E5%8D%95%E7%9A%84%E8%AE%A1%E7%AE%97%E9%A2%983%E5%8F%882%E5%88%86%E4%B9%8B1%E4%B9%98%E8%B4%9F%E4%B8%83%E5%88%86%E4%B9%8B%E4%BA%94%E5%87%8F%E5%8E%BB%E8%B4%9F%E4%B8%83%E5%88%86%E4%B9%8B%E4%BA%94%E4%B9%982%E5%8F%88%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%E5%87%8F%E5%8E%BB%E8%B4%9F%E4%BA%8C%E5%88%86%E4%B9%8B%E4%B8%80%E9%99%A4%E4%BB%A5%E4%BA%94%E5%88%86%E4%B9%8B%E4%B8%83%3F%E6%8A%8A%E6%AD%A5%E9%AA%A4%E5%86%99%E4%B8%8A..%E7%99%BD%E7%BB%99%E5%88%86%E7%9A%84%E9%A2%98..)
超简单的计算题3又2分之1乘负七分之五减去负七分之五乘2又二分之一减去负二分之一除以五分之七?把步骤写上..白给分的题..
超简单的计算题
3又2分之1乘负七分之五减去负七分之五乘2又二分之一减去负二分之一除以五分之七?把步骤写上..白给分的题..
超简单的计算题3又2分之1乘负七分之五减去负七分之五乘2又二分之一减去负二分之一除以五分之七?把步骤写上..白给分的题..
1、原式=(7/3*-5/7)-(-5/7*5/2)-((-1/2)/7/5))
=-3/5+25/14+5/14
=-3/5+30/14
=108/70
=54/35
2、原式=7/3*(-5/7-((-5/7*5/2)-((-1/2)/7/5)))
=7/3*(-5/7+25/14+5/14)
=7/3*20/14
=10/3
(3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(-1/2)/(7/5)
=(7/2)*(-5/7)+(5/7)*(5/2)+(1/2)*(5/7)
=(-35/14)+25/14+5/14
=(-35+25+5)/14
=-5/14
=0.357
(3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(-1/2)/(7/5)
=(3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(1/2)*(-5/7)
=(-5/7)*(3+1/2-2-1/2-1/2)
=(-5/7)*(1/2)
=-5/14
原式=((3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(-1/2)/(7/5)
=(3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(1/2)*(-5/7)
=(-5/7)*(3+1/2-2-1/2-1/2)
=(-5/7)*(1/2)
=-5/14
原式=((3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(-1/2)/...
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原式=((3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(-1/2)/(7/5)
=(3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(1/2)*(-5/7)
=(-5/7)*(3+1/2-2-1/2-1/2)
=(-5/7)*(1/2)
=-5/14
原式=((3+1/2)*(-5/7)-(-5/7)*(2+1/2)-(-1/2)/(7/5)
=(7/2)*(-5/7)+(5/7)*(5/2)+(1/2)*(5/7)
=(-35/14)+25/14+5/14
=(-35+25+5)/14
=-5/14
=0.357
原式=(7/3*-5/7)-(-5/7*5/2)-((-1/2)/7/5))
=-3/5+25/14+5/14
=-3/5+30/14
=108/70
=54/35
原式=7/3*(-5/7-((-5/7*5/2)-((-1/2)/7/5)))
=7/3*(-5/7+25/14+5/14)
=7/3*20/14
=10/3
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