1). 5.2^3+7^11:7^9-1^8 2).400:{5.[360-(290+2.5^2)]}

2 bình luận về “1). 5.2^3+7^11:7^9-1^8 2).400:{5.[360-(290+2.5^2)]}”

1. $\text{1 .}$

   $\text{ 5 . 2³ + $7^{11}$ : $7^{9}$}$

   $\text{ = 5 . 8 + $7^{11-9}$}$

   $\text{ = 5 . 8 + 7²}$

   $\text{ = 80 + 49}$

   $\text{ = 129}$

   $\text{2 .}$

   $\text{ 400 : { 5 . [ 360 – ( 290 + 2 . 5² )]}}$

   $\text{ = 400 : { 5 . [ 360 – ( 290 + 2 . 25)}$

   $\text{ = 400 : { 5 . [ 360 – ( 290 + 50 )}$

   $\text{ = 400 : { 5 . [ 360 – 340 ]}$

   $\text{ = 400 : { 5 . 20 }}$

   $\text{ = 400 : 100}$

   $\text{ = 4}$

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   Trả lời
2. 1)

   5.2^3+7^11:7^9-1^8

   =5.8+7^2-1

   =5.8+49-1

   =40+49-1

   =89-1

   =88

   2)

   400:{5.[360-(290+2.5^2)]}

   =400:{5.[360-(290+2.25)]}

   =400:{5.[360-(290+50)]}

   =400:{5.[360-340]}

   =400:{5.20}

   =400:100

   =4

   Trả lời