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简便: 1又1/6 × 1又1/7 × 1又1/8 × 1又1/9 × 1又1...

解: 原式 =7/6x8/7x9/8x10/9x11/10 (中间的数字约分约掉了) =11/6

2

7/6x8/7x……x120/119=20

简便计算 199又1/9×1又1/8+599又1/7×1又1/6-201又1/9×9/10-601又1/7×7/8 =(200-8/9)×9/8+(600-6/7)×7/6-(200+10/9)×9/10-(600+8/7)×7/8 =200×9/8-8/9×9/8+600×7/6-6/7×7/6-200×9/10-10/9×9/10-600×7/8-8/7×7/8 =225-1+700-1-180-1-625-1 =(225+7...

91又1/8×8/9+71又1/6×6/7+31又1/2×2/3 =(90+9/8)×9/8+(70+7/6)×6/7+(30+3/2)×2/3 =90×8/9+9/8×9/8+70×6/7+7/6×6/7+30×2/3+3/2×2/3 =80+1+60+1+20+1 =163

原式=(7/6)x(8/7)x(9/8)....x(119/118)x(1/119)=1/6 感谢您对清源教育的支持

=6/5×7/6×8/7×9/8×10/9×11/10 约分 =11/5

(1+1/6)×(1+1/7)×(1+1/8)×......×(1+1/118)×(1+1/119) =7/6x8/7x9/8x......x119/118x120/119 =120/6 =20

1/5×1/6=1/5-1/6, 1/6×1/7=1/6-1/7, 1/7×1/8=1/7-1/8, 1/8×1/9=1/8-1/9 1/9×1/10=1/9-1/10 1/5×1/6+1/6×1/7+1/7×1/8+1/8×1/9+1/9×1/10 =1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10 =1/5-1/10 =2/10-1/10 =1/10 类似的题有: 写出以下式子的...

7/8+9又7/8+99又7/8+1/8×3 =(7/8+1/8)+9+(7/8+1/8)+99+(7/8+1/8) =1+9+1+99+1 =111

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