分析:(1)根據(jù)乘法結(jié)合律進(jìn)行簡(jiǎn)算;
(2)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(3)3.2=4×0.8,然后再根據(jù)乘法結(jié)合律進(jìn)行簡(jiǎn)算;
(4)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(5)0.44=4×0.11,然后再根據(jù)乘法結(jié)合律進(jìn)行簡(jiǎn)算;
(6)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算.
解答:解:(1)1.97×0.25×0.4
=1.97×(0.25×0.4)
=1.97×0.1
=0.197;
(2)(2.5+0.25)×0.8
=2.5×8+0.25×8
=20+2
=22;
(3)3.2×12.5
=(4×0.8)×12.5
=4×(0.8×12.5)
=4×10
=40;
(4)5.71×8.3-5.71×7.3
=5.71×(8.3-7.3)
=5.71×1
=5.71;
(5)0.25×0.44
=0.25×(4×0.11)
=(0.25×4)×0.11
=1×0.11
=0.11;
(6)46.23×3.6+6.4×46.23
=46.23×(3.6+6.4)
=46.23×10
=462.3.
點(diǎn)評(píng):完成本題要注意分析式中數(shù)據(jù),運(yùn)用合適的簡(jiǎn)便方法計(jì)算.