分析:(1)先將原式變形為(4.7+5.3)+(7.69+2.31),再按照運(yùn)算順序計(jì)算即可;
(2)先將原式變形為(53.78+6.22)-(13.6+37.4),再按照運(yùn)算順序計(jì)算即可;
(3)先將原式變形為57×(100+1)-57=57×100+(57×1-57),再按照運(yùn)算順序計(jì)算即可;
(4)先算括號(hào)里面的,再算除法,最后算乘法;
(5)先算括號(hào)里的除法,再算加法,最后算括號(hào)外面的減法.
(6)先算括號(hào)里面的,再算減法,最后算加法.
解答:解:據(jù)分析解答如下:
(1)4.7+7.69+5.3+2.31,
=(4.7+5.3)+(7.69+2.31),
=10+10,
=20.
(2)53.78-13.6-37.4+6.22,
=(53.78+6.22)-(13.6+37.4),
=60-51,
=9.
(3)57×101-57,
=57×(100+1)-57,
=57×100+(57×1-57),
=5700.
(4)(520+480)÷50×4,
=1000÷50×4,
=20×4,
=80.
(5)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345.
(6)60-(21.5-8.8)+7.3,
=60-12.7+7.3,
=47.3+7.3,
=54.6.
點(diǎn)評(píng):此類題目,應(yīng)依據(jù)題目特點(diǎn),靈活的選擇計(jì)算方法.