a )
254-[453-(-257)] = 254-710 = 254-[453+257] = 254-710 = -456 b)
-427-375-(-854+751) = -802-(-103) = -802+103 = -699 c)
547-[783-345+(-619)] = 547+181 = 547-[783-345-619] = 547-(-181) = 547+181 = 728 d)
[829-(-271)] + (-829+271) = [829+271]+(-558) = 1100-558 = 542
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b) - 427 -375 - ( - 103 ) = -427 - 375 + 103 = - 699
c) 547 - ( 783 - 345 - 619 ) = 547 - ( - 181 ) = 547 + 181 = 728
d) (829+271) + ( - 558) = 1100 - 558 = 542
a )
254-[453-(-257)] = 254-710 = 254-[453+257] = 254-710 = -456
b)
-427-375-(-854+751) = -802-(-103) = -802+103 = -699
c)
547-[783-345+(-619)] = 547+181 = 547-[783-345-619] = 547-(-181) = 547+181 = 728
d)
[829-(-271)] + (-829+271) = [829+271]+(-558) = 1100-558 = 542