б) (678 + 98) - 517 = 259
в) 900 - ( 859 - 214 ) = 255
г) (800 - 218) + ( 326+92) = 1000
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б) (678 + 98) - 517 = 259
в) 900 - ( 859 - 214 ) = 255
г) (800 - 218) + ( 326+92) = 1000