Bài 162 trang 93 SBT toán 6 tập 1

Đề bài

Tính các tổng sau:

\(a)\) \({\rm{}}\left[ {\left( { - 8} \right) + \left( { - 7} \right)} \right] + \left( { - 10} \right)\) ;

\(b)\) \( 555 - (-333) - 100 - 80\) ;

\(c)\) \(-(-229) + (-219) – 401 + 12\) ;

\(d)\) \(300 – (-200) – (-120) +18\).

Lời giải

\(a)\) \({\rm{}}\left[ {\left( { - 8} \right) + \left( { - 7} \right)} \right] + \left( { - 10} \right) \)

\(=\left( { - 15} \right) + \left( { - 10} \right) =  - 25\) 

\(b)\) \(555 - ( - 333) - 100 - 80\)

\(=\left( {555 + 333} \right) - (100 + 80)\) 

\(= 888 – 180 = 708\)

\(c)\) \( -(-229) + (-219) – 401 + 12\)

\(= (229 – 219) – (401 – 12)\)

\(= 10 – 389 = - 379\)

\(d)\) \(300 – (-200) – (-120) +18\)

\(= (300 + 200) + (120 + 18)\)

\(= 500  + 138 = 638\)


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