分析:(1)把234+(366+42)+158改寫成(234+366)+(42+158),從而簡(jiǎn)算;
(2)按照先算括號(hào)里面的加法,再算括號(hào)外面的除法,最后算括號(hào)外面的減法得解;
(3)把416-327+184-273改寫成(416+184)-(327+273),從而簡(jiǎn)算;
(4)按照先算括號(hào)里面的乘法,再算括號(hào)里面的加法,最后算括號(hào)外面的除法得解.
解答:解:(1)234+(366+42)+158,
=(234+366)+(42+158),
=600+200,
=800;
(2)2870÷(17+65)+178,
=2870÷82+178,
=35+178,
=213;
(3)416-327+184-273,
=(416+184)-(327+273),
=600-600,
=0;
(4)(398+74×17)÷24,
=(398+1258)÷24,
=1656÷24,
=69.
點(diǎn)評(píng):此題主要考查整數(shù)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.