(1)某数是:(72+20)×3,=92×3,=276,正确的得数是:276×3+20,=828+20,=848.答:某数是276,正确的得数是848.(2)(1740-25)÷49,=1715÷49,=35;7140÷35=204;答:正确的商是204.
某数:(72+20)×3=276正确得数:276×6×3+20=848