1.

Please explain ......​

Answer»

1000 + ( - 100) = 1000 - 100 = 900 \\  \\  - 20 + 11 =  - 9 \\  \\ 900 \div ( - 9) =  - 900 \div 9 =  - 100   \: hope \: it \: is \: useful. \\



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