分析:(1)先根據(jù)積不變規(guī)律,把4.8×0.671變成0.48×6.71,再運(yùn)用乘法分配律簡(jiǎn)算;
(2)先算小括號(hào)里面的減法,再運(yùn)用乘法交換律簡(jiǎn)算;
(3)先把102分解成100+2,再運(yùn)用乘法分配律簡(jiǎn)算;
(4)根據(jù)除法的性質(zhì)簡(jiǎn)算;
(5)先算乘法,再算減法,最后算加法.
解答:解:(1)6.71×0.52+4.8×0.671,
=6.71×0.52+0.48×6.71,
=6.71×(0.52+0.48),
=6.71×1,
=6.71;
(2)2.5×(3.5-1.65)×0.4,
=2.5×1.85×0.4,
=2.5×0.4×1.85,
=1×1.85,
=1.85;
(3)102×4.5,
=(100+2)×4.5,
=100×4.5+2×4.5,
=450+9,
=459;
(4)6.25÷1.25÷0.8,
=6.25÷(1.25×0.8),
=6.25÷1,
=6.25;
(5)8.3-2.63+2.73×1.5,
=8.3-2.63+4.095,
=5.67+4.095,
=9.765.
點(diǎn)評(píng):本題考查了四則混合運(yùn)算,注意運(yùn)算順序和運(yùn)算法則,靈活運(yùn)用所學(xué)的運(yùn)算定律進(jìn)行簡(jiǎn)便計(jì)算.