简便计算
1/10×12+1/12×14+1/14×16+1/16×181/1×3+1/3×5+1/5×7+···+1/99×1014/3-7/12+9/20-11/30+13/4...
1/10×12+1/12×14+1/14×16+1/16×18
1/1×3+1/3×5+1/5×7+···+1/99×101
4/3-7/12+9/20-11/30+13/42-15/56
5/4-9/20+11/30-13/42+15/56
1/8+1/16+1/32+1/64+1/128
2/3+2/9+2/27+2/81
9.7+99.7+999.7+9999.7+99999.7
(1/2+1/3+1/4)×(1/3+1/4+1/5)-(1/2+1/3+1/4+1/5)×(1/3+1/4)
(1/6+1/7+1/8)×(1/7+1/8+1/9)-(1/6+1/7+1/8+1/9)×(1/7+1/8) 展开
1/1×3+1/3×5+1/5×7+···+1/99×101
4/3-7/12+9/20-11/30+13/42-15/56
5/4-9/20+11/30-13/42+15/56
1/8+1/16+1/32+1/64+1/128
2/3+2/9+2/27+2/81
9.7+99.7+999.7+9999.7+99999.7
(1/2+1/3+1/4)×(1/3+1/4+1/5)-(1/2+1/3+1/4+1/5)×(1/3+1/4)
(1/6+1/7+1/8)×(1/7+1/8+1/9)-(1/6+1/7+1/8+1/9)×(1/7+1/8) 展开
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