Evaluate. (a). -31÷ [(-30)+(-1)] (b). [(-72)÷(-12)÷(-12)÷[36÷18]
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(a)-31/-31=1
(b)-72*1/12*-1/12divided 2
-1/2/2=-1/4
(b)-72*1/12*-1/12divided 2
-1/2/2=-1/4
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