分析:(1)先算小括號(hào)里面的減法,再算括號(hào)外的除法;
(2)先算小括號(hào)里面的減法,再算中括號(hào)里面的乘法,最后算括號(hào)外的除法;
(3)根據(jù)連續(xù)除以兩個(gè)數(shù)等于除以這兩個(gè)數(shù)的積簡(jiǎn)算;
(4)按照從左到右的順序計(jì)算,注意本題與(3)題的不同;
(5)先算小括號(hào)里面的減法,再算中括號(hào)里面的乘法,最后算括號(hào)外的除法;
(6)同時(shí)計(jì)算乘法,最后算加法.
解答:解:(1)96÷(15.4-12.2),
=96÷3.2,
=30;
(2)9÷[0.3×(8-6.5)],
=9÷[0.3×1.5],
=9÷0.45,
=20;
(3)0.175÷0.25÷0.4,
=0.175÷(0.25×0.4),
=0.175÷0.1,
=1.75;
(4)0.175÷0.25×4,
=0.7×4,
=2.8;
(5)0.36÷[(6.1-4.6)×0.8],
=0.36÷[1.5×0.8],
=0.36÷1.2,
=0.3;
(6)3.6×0.4+1.2×5,
=1.44+6,
=7.44.
點(diǎn)評(píng):四則混合運(yùn)算的順序:
1、如果是同一級(jí)運(yùn)算,一般按從左往右依次進(jìn)行計(jì)算;
2、如果既有加減、又有乘除法,先算乘除法、再算加減;
3、如果有括號(hào),先算括號(hào)里面的;
4、如果符合運(yùn)算定律,可以利用運(yùn)算定律進(jìn)行簡(jiǎn)算.