\(435-167-89-435-89\\=(435-435)-(167+89+89)\\=-(256+89)\\=-345\)

435 − 167 − 89 − 435 − 89

=(435 − 435) − (167 + 89 + 89)

= −(256 + 89)

= -345

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(-67) + 125 + (-33) + 75

= [(-67) + (-33)] + (125 + 75)

= -100 + 200

= 100

a: \(\left[\left(-59\right)+71\right]-\left[\left(-83\right)-\left(-95\right)\right]\)

\(=\left[71-59\right]-\left[-83+95\right]\)
=12-12

=0

b: \(\left(435-167-89\right)-\left(435-89\right)\)

\(=435-167-89-435+89\)

\(=\left(435-435\right)+\left(89-89\right)-167\)

=0+0-167

=-167

c: \(\left(-624\right)-\left[\left(376+245\right)-45\right]\)

\(=\left(-624\right)-\left[376+245-45\right]\)

\(=\left(-624\right)-376-200\)

=-1000-200

=-1200

a.263

b.-234

c.-167

a, 1000 - ( 137 + 572 ) + ( 263 - 291 )=263

b, ( -1999 ) - ( 234 - 1999 )=-234

c, ( 435 - 167 - 89 ) - ( 435 - 89 )=-167

(-7264)+(1543+7264)

=-7264+1543+7264

=(-7264+7264)+1543

=0+1543=1543

(435-167-89)-(435-89)

=435-167-89-435+89

=(435-435)+(-89+89)+(-167)

=0+0+(-167)=-167

(-7264)+(1543+7264)

=(-7264)+1543+7264

=(-7264+7264)+1543

=0+1543

=1542

(435-167-89)-(435-89)

=435-167-89-435+89

=(435-435)+(-89+89)-167

=0+0-167

-167

358+694+258:2

=358+694+129

=1181

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1181

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\(\dfrac{435\cdot234-89}{233\cdot435+346}=1\)

1.

a) = 354

b) = -54

c) = -167

b: =-2021+21-75+2021=-54

a) = 354

b) = -54

c) = -167