解:①78×34-42×33,
=2652-1386,
=1266;
②54×(25+17),
=54×42,
=2268;
③(360-180÷5)×4,
=(360-36)×4,
=324×4,
=1296;
④672÷〔(26-14)×8〕,
=672÷[12×8],
=672÷96,
=7;
⑤[485÷(69+28)]×120,
=[485÷97]×120,
=5×120,
=600.
分析:①78×34-42×33,78×34和42×33 同時(shí)計(jì)算,再算減;
②54×(25+17)先算括號(hào)里的加,再算括號(hào)外面的乘;
③(360-180÷5)×4先算括號(hào)里的除,再算括號(hào)里面的減,最后算括號(hào)外面的乘;
④672÷〔(26-14)×8〕先算小括號(hào)里的減,再算中括號(hào)里面的乘,最后算括號(hào)外面的除;
⑤[485÷(69+28)]×120先算小括號(hào)里的加,再算中括號(hào)里面的除,最后算括號(hào)外面的乘.
點(diǎn)評(píng):此題主要考查整數(shù)的四則混合運(yùn)算的運(yùn)算順序和應(yīng)用運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.