(1)60.28+0.72×4.3
(2)6.37-0.37×16
(3)3.8×99
(4)2.5×9×0.4×1.1
(5)2.6×(10.6-9.72)
(6)1.25×888.
解:(1)60.28+0.72×4.3,
=60.28+3.096,
=63.376;
(2)6.37-0.37×16,
=6.37-5.92,
=0.45;
(3)3.8×99,
=3.8×(100-1),
=3.8×100-3.8×1,
=380-3.8,
=376.2;
(4)2.5×9×0.4×1.1,
=(2.5×0.4)×(9×1.1),
=1×9.9,
=9.9;
(5)2.6×(10.6-9.72),
=2.6×0.88,
=2.288;
(6)1.25×888,
=1.25×(8×111),
=(1.25×8)×111,
=10×111,
=1110.
分析:(1)先算乘法,再算加法;
(2)先算乘法,再算減法;
(3)根據(jù)乘法分配律進行簡算;
(4)根據(jù)乘法交換律和結(jié)合律進行簡算;
(5)先算減法,再算乘法;
(6)根據(jù)乘法結(jié)合律進行簡算.
點評:考查了運算定律與簡便運算,四則混合運算.注意運算順序和運算法則,靈活運用所學(xué)的運算律簡便計算.