2.5×6.6×0.4(9.87+9.87+9.87+9.87)×2516.7×0.4+15.5
1.96×0.57+1.96×0.436.75+23.4÷7.20.65×201.

解:(1)2.5×6.6×0.4,
=2.5×0.4×6.6,
=1×6.6,
=6.6;

(2)(9.87+9.87+9.87+9.87)×25,
=(9.87×4)×25,
=9.87×(4×25),
=9.87×100,
=987;

(3)16.7×0.4+15.5,
=6.68+15.5,
=22.18;

(4)1.96×0.57+1.96×0.43,
=1.96×(0.57+0.43),
=1.96×1,
=1.96;

(5)6.75+23.4÷7.2,
=6.75+3.25,
=10;

(6)0.65×201,
=0.65×(200+1),
=0.65×200+0.65×1,
=130+0.65,
=130.65.
分析:(1)運用乘法交換律簡算;
(2)先根據(jù)乘法的意義,把小括號里面的加法算式變成乘法算式,再運用乘法結(jié)合律簡算;
(3)先算乘法,再算加法;
(4)運用乘法分配律簡算;
(5)先算除法,再算加法;
(6)先把201分解成200+1,再運用乘法分配律簡算.
點評:本題考查了四則混合運算,注意運算順序和運算法則,靈活運用所學(xué)的運算定律進行簡便計算.
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