Tính nhanh vậy có thể: `d) 4/9 . 23/11 – 1/11 . 4/9 + 4/9` ` e) 1/7 . (-3/8) + -13/18 . 1/7` `g) (1/117` `-` `4/123)` `- (118

2 bình luận về “Tính nhanh vậy có thể: `d) 4/9 . 23/11 – 1/11 . 4/9 + 4/9` ` e) 1/7 . (-3/8) + -13/18 . 1/7` `g) (1/117` `-` `4/123)` `- (118”

1. $\text{d) }\frac{4}{9}\text{.}\frac{23}{11}\text{ – }\frac{1}{11}\text{.}\frac{4}{9}\text{ + }\frac{4}{9}$

   $\text{= }\frac{4}{9}\text{.(}\frac{23}{11}\text{ – }\frac{1}{11}\text{ + 1) }$

   $\text{= }\frac{4}{9}\text{.(}\frac{22}{11}\text{ + 1) }$

   $\text{= }\frac{4}{9}\text{.(2 + 1) }$

   $\text{= }\frac{4}{9}\text{.3 }$

   $\text{= }\frac{12}{9}$

   $\text{= }\frac{4}{3}$

   —————————————————

   $\text{e) }\frac{1}{7}\text{.(-}\frac{13}{18}\text{) + – }\frac{13}{18}\text{.}\frac{1}{7}$

   $\text{= }\frac{1}{7}\text{.(-}\frac{3}{8}\text{ – }\frac{13}{18})\text{) }$

   $\text{= }\frac{1}{7}\text{.(-}\frac{79}{72}\text{) }$

   $\text{=- }\frac{79}{504}$

   ——————————————————–

   $\text{ g) (}\frac{1}{117}\text{ – }\frac{4}{123}\text{) – (}\frac{118}{117}\text{ – }\frac{1}{2}\text{ + }\frac{119}{123}\text{) }$

   $\text{= }\frac{1}{117}\text{ – }\frac{4}{123}\text{ – }\frac{118}{117}\text{ + }\frac{1}{2}\text{ – }\frac{119}{123}$

   $\text{= (}\frac{1}{117}\text{ – }\frac{118}{117}\text{) – (}\frac{4}{123}\text{ + }\frac{119}{123}\text{) + }\frac{1}{2}$

   $\text{= -}\frac{117}{117}\text{ – }\frac{123}{123}\text{ + }\frac{1}{2}$

   $\text{= -1 – 1 + }\frac{1}{2}$

   $\text{= -2 + }\frac{1}{2}$

   $\text{= -}\frac{3}{2}$

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   Trả lời
2. Giải đáp:

   d) 4/9 . 23/11 – 1/11 . 4/9 + 4/9

   = 4/9 . (23/11 – 1/11 + 1)

   = 4/9 . (22/11 + 1)

   = 4/9 . (2+1)

   = 4/9 . 3

   = 4/3

   e) 1/7 . (-3/8) + (-13/18) . 1/7

   = 1/7 . (-3/8 – 13/18)

   = 1/7 . (-79/72)

   = -79/504

   g) (1/117 – 4/123) – (118/117 – 1/2 + 119/123)

   = 1/117 – 4/123 – 118/117 + 1/2 – 119/123

   = (1/117 – 118/117) + (-4/123 – 119/123) + 1/2

   = -1 + (-1) + 1/2

   = -2 + 1/2

   = -3/2

    

   Trả lời