e) 2345 1000 : [19 2.(21 18)^2] f) 125.(28 + 72) 25.(3^2.4 + 64) g) 500 {5.[409 (2^3.3 21)^2] + 10^3} : 15

Đáp án`+`Giải thích các bước giải:

` e) 2345 - 1000 : [19 - 2 xx (21 - 18)^2] `

` = 2345 - 1000 : [19 - 2 xx 3^2] `

` = 2345 - 1000 : [19 - 18] `

` = 2345 - 1000 : 1 `

` = 2345 - 1000 `

` = 1345 `

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` f) 125 xx (28 + 72) - 25 xx (3^2 xx 4 + 64) `

` = 125 xx 100 - 25 xx (36 + 64) `

` = 125 xx 100 - 25 xx 100 `

` = (125 - 25) xx 100 `

` = 100 xx 100 `

` = 10000 `

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` g) 500 - {5 xx [409 - (2^3 xx 3 - 21)^2] + 10^3} : 15 `

` = 500 - {5 xx [409 - (8 xx 3 - 21)^2] + 1000} : 15 `

` = 500 - {5 xx [409 - (24 - 21)^2] + 1000} : 15 `

` = 500 - {5 xx [409 - 3^2] + 1000} : 15 `

` = 500 - {5 xx 400 + 1000} : 15 `

` = 500 - {2000 + 1000} : 15 `

` = 500 - 3000 : 15 `

` = 500 - 200 `

` = 300 `

`color{pink}{#Ruki}`