1-5/2×3+2/3×5+12/5×7-1/7×8=?
答案:1 悬赏:70 手机版
解决时间 2021-11-25 14:05
- 提问者网友：愿为果
- 2021-11-25 06:34
1-5/2×3+2/3×5+12/5×7-1/7×8=?
最佳答案
- 五星知识达人网友：大漠
- 2021-11-25 06:48
（1）1-5/2×3+2/3×5+12/5×7-1/7×8
=1-15/2+10/3+84/5-8/7
=1-15/2+84/5+10/3-8/7
=10/10-75/10+168/10+70/21-24/21
=(10-75+168)/10+(70-24)/21
=103/10+46/21
=2163/210+460/210
=2623/210
（2）1-5/(2×3)+2/(3×5)+12/(5×7)-1/(7×8)
=1-(1/2+1/3)+(1/3-1/5)+(1/5+1/7)-(1/7-1/8)
=1-1/2-1/3+1/3-1/5+1/5+1/7-1/7+1/8
=1-1/2+1/8
=1/2+1/8
=4/8+1/8
=5/8
=1-15/2+10/3+84/5-8/7
=1-15/2+84/5+10/3-8/7
=10/10-75/10+168/10+70/21-24/21
=(10-75+168)/10+(70-24)/21
=103/10+46/21
=2163/210+460/210
=2623/210
（2）1-5/(2×3)+2/(3×5)+12/(5×7)-1/(7×8)
=1-(1/2+1/3)+(1/3-1/5)+(1/5+1/7)-(1/7-1/8)
=1-1/2-1/3+1/3-1/5+1/5+1/7-1/7+1/8
=1-1/2+1/8
=1/2+1/8
=4/8+1/8
=5/8
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