分析:(1)先算乘法與除法,再算減法;
(2)可根據(jù)加法交換律計(jì)算;
(3)可將24拆分為8×3后再計(jì)算;
(4)根據(jù)乘法分配律計(jì)算即可;
(5)可根據(jù)四則混合運(yùn)算的運(yùn)算順序計(jì)算:先算乘除,再算加減,有括號(hào)要先算括號(hào)里面的;
(6)可根據(jù)一個(gè)數(shù)減兩個(gè)數(shù),等于用這個(gè)數(shù)減去這兩個(gè)數(shù)的和的減法性質(zhì)計(jì)算.
解答:解:(1)15×27-3000÷15
=405-200
=205
(2)3.7+0.71+6.3
=3.7+6.3+0.71
=10+0.71
=10.71
(3)125×24×7
=125×8×3×7
=1000×3×7
=21000
(4)147×8+8×53
=(147+53)×8
=200×8
=1600
(5)(324-285)×12÷26
=39×12÷26
=468÷26
=18
(6)6.46-3.54-2.46
=6.46-(3.54+2.46)
=6.46-6
=0.46.
點(diǎn)評(píng):完成本題要注意分析式數(shù)據(jù)的特點(diǎn)及內(nèi)在聯(lián)系,然后選擇合適的方法計(jì)算.