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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...

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一又六分之1×1又七分之1×1又八分之1×1又九分之一 =7/6*8/7*9/8*10/9 交叉约分可得: 5/3 答

(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

8.9*1.1+15.7*8.9+6.8*1.1 =(8.9+6.8)*1.1+15.7*8.9 =15.7*1.1+15.7*8.9 =15.7*(1.1+8.9) =15.7*10 =157 嘎嘎,这样可以了吧,还上小学呢吧,就学会用网络了,厉害!

希望能够帮到你

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

1又1/6-8又3/4×2/7 =1又1/6-35/4×2/7 =7/6-5/2 =7/6-15/6 =-8/6 =-4/3

(7/8+1又5/16)×1又1/7等于多少 (7/8+1又5/16)×1又1/7 =(7/8+1+5/16)×(1+1/7) =(7/8+1+5/16)×(8/7) =(7/8)×(8/7)+1×(8/7)+(5/16)×(8/7) =1+(8/7)+5/14 =1+16/14+5/14 =(14+16+5)/14 =35/14 =(5x7)/(2x7) =5/2 =2.5

裂项求和:最后化为五分之一减十分之一等于十分之一(例如五分之一乘六分之一化为五分之一减六分之一,都这么化)

1/5×6 +1/6×7+ 1/7×8 +•••+ 1/18×19+ 1/19×20 =1/5-1/6 +1/6-1/7+ 1/7-1/8 +•••+ 1/18-1/19+ 1/19-1/20 =1/5-1/20 =3/20

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