分析:算式(2)可以根據(jù)一個(gè)數(shù)減兩個(gè)數(shù)的和等于用這個(gè)數(shù)分別減去這兩個(gè)數(shù)的減法性質(zhì)進(jìn)行簡便計(jì)算;
算式(4)可以根據(jù)加法交換律及結(jié)合律進(jìn)行簡便計(jì)算;
算式(5)可以根據(jù)一個(gè)數(shù)減兩個(gè)數(shù)等于減去這兩個(gè)數(shù)的和的減法性質(zhì)去計(jì)算;
算式(6)根據(jù)除法的性質(zhì)簡算;
其余算式根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算即可:先算乘除,再算加減,有括號的要先算括號里面的.
解答:解:(1)30600÷(6+4×2+4)
=30600÷18,
=1700;
(2)5.08-(1.08+2.59)
=5.08-1.08-2.59,
=4-2.59,
=1.41;
(3)20-(3.7-1.55+0.82)
=20-(2.15+0.82),
=20-2.97,
=17.03;
(4)18.44+7.17+2.83+1.56
=(18.44+1.56)+(7.17+2.83),
=20+10,
=30;
(5)13.6-4.25-5.75
=13.6-(4.25+5.75),
=13.6-10,
=3.6;
(6)[240+(124-118)×12]÷8
=[240+6×12]÷8,
=[240+72]÷8,
=240÷8+72÷8,
=30+9,
=39.
點(diǎn)評:在完成有關(guān)于小數(shù)的四則混合運(yùn)算時(shí),要注意小數(shù)點(diǎn)的對齊與小數(shù)點(diǎn)位置的變化.