分析:①8.2×99+8.2利用乘法的分配律变成8.2×(99+1)计算简便;
②4.8×0.25变成4×1.2×0.25,再利用乘法的结合律计算简便;
③0.78×9.9变成0.78×(10-0.1)再利用乘法的分配律;
④8.96×0.32-0.96×0.32利用乘法的分配律变成0.32×(8.96-0.96);
⑤2.6×1.9÷2.6×1.9利用乘法的交换律变成1.9×2.6÷2.6×1.9计算简便.
解答:解:①8.2×99+8.2,
=8.2×(99+1),
=8.2×100,
=820;
②4.8×0.25,
=4×1.2×0.25,
=(4×0.25)×1.2,
=1×1.2,
=1.2;
③0.78×9.9,
=0.78×(10-0.1),
=0.78×10-0.78×0.1,
=7.8-0.078,
=7.722;
④8.96×0.32-0.96×0.32,
=0.32×(8.96-0.96),
=0.32×8,
=2.56;
⑤2.6×1.9÷2.6×1.9,
=1.9×2.6÷2.6×1.9,
=1.9×1.9,
=3.61.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.