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b) 107-7*(321-312)=107-7*9=107-63=44
c) (3³+73)*49=(27+73)*49=100*49=4900
d) (27+45):6*11+70=72:6*11+70=12*11+70=132+70=202
e) 200*6-490:(93-23)=1200-490:70=1200-7=1193
f) 18+(178-78)*9=18+100*9=18+900=918