7.5X2.37+25X0.189=? 1-1/2+1/6+1/12+1/20+1/30+.......+1/72+1/90=?
来源:百度知道 编辑:UC知道 时间:2024/07/08 01:11:01
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7.5X2.37+25X0.189
=25X0.3X2.37+25X0.189
=25X0.711+25X0.189
=25X(0.9)
=22.5
1-1/2+1/6+1/12+1/20+1/30+.......+1/72+1/90
=0/3/7/13/21/30+.......+1/72+1/90
=0
7.5X2.37+25X0.189
=25X0.3X2.37+25X0.189
=25X0.711+25X0.189
=25X(0.9)
=22.5
1-1/2+1/6+1/12+1/20+1/30+.......+1/72+1/90
=1-1/1*2 + 1/2*3 + 1/3*4 ......+1/9*10
=1-(1-1/2 + 1/2-1/3 + 1/3-1/4......+1/9-1/10)
=1-(1- 1/10)
=1/10
第二个=1-1/2+1/2-1/3+1/3-1/4+1/4-...—1/10=9/10
第一个=3×25×0.237+25×0.189=25×(0.189+0.711)=22.5
0
7.5X2.37+25X0.189=? 1-1/2+1/6+1/12+1/20+1/30+.......+1/72+1/90=?
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