考點:運算定律與簡便運算
專題:運算順序及法則
分析:(1)可根據(jù)乘法交換律與結(jié)合律計算.
(2)可根據(jù)一個數(shù)減兩個數(shù),等于用這個數(shù)減去這兩個數(shù)的和的減法性質(zhì)計算.
(3)(5)可根據(jù)乘法分配律計算.
(4)可將式中的乘法算式變具有一個相同因數(shù)的乘法算式后,根據(jù)乘法分配律計算.
(6)可將10.2拆分為10+0.2后根據(jù)乘法分配律計算.
解答:
解:(1)8×(36×125)
=8×125×36
=1000×26
=36000;
(2)3.68-0.82-0.18
=3.68-(0.82+0.18)
=3.68-1
=2.68;
(3)36×(
+
)
=36×
+36×
=8+21
=29;
(4)2.25×1.8+77.5×0.18
=22.5×0.18+77.5×0.18
=(22.5+77.5)×0.18
=100×0.18
=18;
(5)[1-(
+
)]×36
=36-(
+
)×36
=36-(
×36+
×36)
=36-(18+12)
=36-30
=6;
(6)13×10.2
=13×(10+0.2)
=13×10+13×0.2
=130+2.6
=132.6.
點評:完成本題要注意分析式中數(shù)據(jù)的特點及內(nèi)在聯(lián)系,然后運用合適的方法計算.