3. Subtract:
a) 500 from
–324
b) - 756 from -- 389
c) - 657 from O
4. Subtract 670 from the sum of 550 and - 379.
5. Find the value of expression:
(0) (--780) + (-- 545) - (1235) + (980)
(ii) (+356)-(--238) -(680) + (--325)
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