a, (27+65)+(346-27-65) = 27 + 65 + 346 - 27 - 65 = ( 27 - 27 ) + ( 65 - 65 ) + 346 = 0 + 0 + 346 = 346 b, (42-69+17)-(42+17) = 42 - 69 + 17 - 42 - 17 = ( 42-42) + ( 17-17) - 69 = 0 + 0 - 69 = - 69
a) (27+65)+(346-27-65)
= 27+65+346-27-65
= (27-27)+(65-65)+346
= 0+0+346
=346
b) (42-69+17)-(42+17)
= 42-69+17-42-17
= (42-42)+(17-17)-69
= 0+0-69
=0-69
=-69
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(27+65)+(346-27-65)= 27+65+346-27-65
= (27-27)+(65-65)+346
= 0+0+346
= 346
(42-69+17)-(42+17)= 42-69+17-42-17
= (42-42)+(17-17)-69
= 0+0-69
= -69
