1.

\left. \begin{array} { l l } { ( a ) } & { 11 + ( - 7 ) } & { ( b ) ( - 13 ) + ( + 18 ) } \\ { ( c ) } & { ( - 10 ) + ( + 19 ) } & { ( d ) ( - 250 ) + ( + 150 ) } \\ { ( - 380 ) + ( - 270 ) } & { ( f ) } & { ( - 217 ) + ( - 100 ) } \end{array} \right.

Answer»

a)11-7=4c)-10+19=9b)-13+18=5d)-250+150=-100e)-380-270=-650f)-217-100=-317



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