简算:5/1*2+5/2*3+5/3*4+…+5/48*49+5/49*50
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简算:5/1*2+5/2*3+5/3*4+…+5/48*49+5/49*50
简算:5/1*2+5/2*3+5/3*4+…+5/48*49+5/49*50
简算:5/1*2+5/2*3+5/3*4+…+5/48*49+5/49*50
5/1*2+5/2*3+5/3*4+…+5/48*49+5/49*50
=5/1-5/2+5/2-5/3+5/3-5/4+…+5/48-5/49+5/49-5/50
=5-5/50
=4.9
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5/1*2+5/2*3+5/3*4+.......+5/48*49+5/49*50
=5(1-1/2+1/2-1/3+1/3-,,,+1/49-1/50)
=5*(1-1/50)
=49/10