分数的简便运算【注:“/”前是分子,后是分母】(1)(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)-【减号】(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)=【是
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分数的简便运算【注:“/”前是分子,后是分母】(1)(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)-【减号】(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)=【是
分数的简便运算
【注:“/”前是分子,后是分母】
(1)
(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)
-【减号】
(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)=
【是不是1/100?】
(2)【它差点整死我…】
(1/123456788-1/123456789)÷(1/123456788-1/123456789)
如果你第一题和我想的一样,
如果不一样,
如果你第二题算不出来,咩关系;
你可以算123456788/123456789+123456789/123456788,因为我算到这里算不出来了……
如果还是不行,咩关系;
你已经尽力了
第二题打错啦!
原题:
(1/123456788-1/123456789)÷(1/123456788+1/123456789)
分数的简便运算【注:“/”前是分子,后是分母】(1)(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)-【减号】(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)=【是
原式=(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)
+(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×1/10
-(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)
-1/10×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)
=(1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)×1/10
-1/10×(1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9)
=1/10
2.第二题你确定给对了?