Simplify:
(a) 1 1 2 + 31 2 + 4 (b) – 50 + 20 – 30 + 40
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(a)112+312+4
= 424+4
= 428
(b)-50+20-30+40
= - 80+60
= - 20
= 424+4
= 428
(b)-50+20-30+40
= - 80+60
= - 20
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