(13+13×2+13)×25

解:(13+13×2+13)×25
=[13×(1+2+1)]×25,
=(13×4)×25,
=13×(4×25),
=13×100,
=1300.
分析:本題可先將括號(hào)內(nèi)的算式根據(jù)乘法分配律變?yōu)?3×4后,再根據(jù)乘法結(jié)合律計(jì)算.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù)的特點(diǎn)及內(nèi)在聯(lián)系,然后運(yùn)用合適的方法計(jì)算.
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