a) ( 17 - 134 - 49) - ( 17 - 49)
=17-134-49-17+49
=17-17-49+49-134
=-134
b) ( - 257) - [( - 257) + 156 - 56]
=-257+257-156+56
=-100
c) 11 - (- 76) + 96 - 10 - ( -89 + 10)
=11+76+96-10+89-10
=252
d) ( - 243 + 345) - [ 257 + ( -55) - 129]
=-243+345-257+55+129
=29
\(a,\left(17-134-49\right)-\left(17-49\right)\\ =17-134-49-17+49\\ =\left(17-17\right)+\left(-49+49\right)-134\\ =-134\\ b,\left(-257\right)-\left[\left(-257\right)+156-56\right]\\ =\left(-257\right)+257-156+56\\ =0-100\\ =-100\\ c,11-\left(-76\right)+96-10-\left(-89+10\right)\\ =11+76+96-10+89-10\\ =\left(11+89\right)+\left(-10-10\right)+\left(76+96\right)\\ =100-20+172\\ =252\\ d,\left(-243+345\right)-\left[257+\left(-55\right)-129\right]\\ =-234+345-257+55+129\\ =111-257+55+129\\ =-146+55+129\\ =-91+129\\ =38\)
a) ( 17 - 134 - 49) - ( 17 - 49)
= 17 - 134 - 49 -17 + 49
= 17 - 17 + 49 - 49 - 134
= (17 - 17) + (49 - 49) - 134
= 0 + 0 - 134
= 0 - 134
= -134
b) ( - 257) - [( - 257) + 156 - 56]
= (-257) - [-101-56]
= (-257)-(-157)
= -100
c) 11 - (- 76) + 96 - 10 - ( -89 + 10)
= 11 + 76 + 96 - 10 - (-79)
= 11 + 76 + 96 - 10 + 79
= 87 + 96 - 10 + 79
= 183 - 10 + 79
= 173 + 79
= 252
d) ( - 243 + 345) - [ 257 + ( -55) - 129]
= 102 - [202 - 129]
= 102 - 73
= 29
