问题标题：
【数学题8到简算要写清楚点9.7/9×2/13+11/9×7/1310.3/8×7+0.37511.1/1×3+1/3×5+1/5×7+1/7×912.1/3×1/8+1/8×1/13+1/13×1/1813.1/4-1/8-1/16-1/32-1/6414.1/4+1/8+1/16+1/32+1/6415.1/6+1/12+1/20+1/3016.7/6+13/12+21/20+31/30=(7*2)/(9*13)】
问题描述：
数学题8到简算要写清楚点
9.7/9×2/13+11/9×7/1310.3/8×7+0.375
11.1/1×3+1/3×5+1/5×7+1/7×9
12.1/3×1/8+1/8×1/13+1/13×1/18
13.1/4-1/8-1/16-1/32-1/6414.1/4+1/8+1/16+1/32+1/64
15.1/6+1/12+1/20+1/3016.7/6+13/12+21/20+31/30
=(7*2)/(9*13)+(11*7)(9*13)
是7×29×13吗？
下面的哪位看不懂
帮我解答下就OK咯
李景茹回答：
9.7/9×2/13+11/9×7/13=(7*2)/(9*13)+(11*7)(9*13)=(7*13)/(9*13)=7/910.3/8×7+0.375=(3/8)*7+3/8=(3/8)(7+1)=311.1/1×3+1/3×5+1/5×7+1/7×9=(1/2)(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9)=(1/2)(1-1/9)=4/912.1...
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