分析:(1)先算小括號(hào)內(nèi)乘法,再算小括號(hào)內(nèi)減法,最后算括號(hào)外除法;
(2)先算乘法,然后根據(jù)減法的性質(zhì):連續(xù)減去兩個(gè)數(shù),等于減去這兩個(gè)數(shù)的和;進(jìn)行解答;
(3)根據(jù)減法的性質(zhì):連續(xù)減去兩個(gè)數(shù),等于減去這兩個(gè)數(shù)的和;進(jìn)行解答;
(4)運(yùn)用乘法分配律進(jìn)行簡算.
解答:解:①(9.15-0.45×3.6)÷0.3
=(9.15-1.62)÷0.3
=7.53÷0.3
=25.1
②17.6-0.5×0.5-0.75
=17.6-0.25-0.75
=17.6-(0.25+0.75)
=17.6-1
=16.6
③5.639-1.732-2.268
=5.639-(1.732+2.268)
=5.639-4
=1.639
④7.86×1.7-0.7×7.86
=7.86×(1.7-0.7)
=7.86×1
=7.86
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡便方法計(jì)算.