脫式計(jì)算(能簡(jiǎn)算的要簡(jiǎn)算)
0.75×4×0.25×4               
9.6+9.9×99              6.3×10.1
15.58÷8.2-0.72                 4.536÷0.8÷14           2.8×3.6+1.4×2.8.
分析:(1)根據(jù)乘法交換律和結(jié)合律進(jìn)行簡(jiǎn)算;
(2)把9.6看作9.9-0.3,然后根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(3)把10.1拆成10+0.1,再根據(jù)乘法分配律進(jìn)行簡(jiǎn)算;
(4)先計(jì)算除法,再計(jì)算減法;
(5)按照從左向右的順序進(jìn)行計(jì)算;
(6)根據(jù)乘法分配律進(jìn)行簡(jiǎn)算.
解答:解:(1)0.75×4×0.25×4,
=(0.75×4)×(0.25×4),
=3×1,
=3;

(2)9.6+9.9×99,
=(9.9-0.3)+9.9×99,
=9.9+9.9×99-0.3,
=9.9×(1+99)-0.3,
=9.9×100-0.3,
=990-0.3,
=989.7;

(3)6.3×10.1,
=6.3×(10+0.1),
=6.3×10+6.3×0.1,
=63+0.63,
=63.63;

(4)15.58÷8.2-0.72,
=1.9-0.72,
=1.18;

(5)4.536÷0.8÷14,
=5.67÷14,
=0.405;

(6)2.8×3.6+1.4×2.8,
=2.8×(3.6+1.4),
=2.8×5,
=14.
點(diǎn)評(píng):小數(shù)的混合運(yùn)算,先弄清運(yùn)算順序,然后再進(jìn)行計(jì)算,能簡(jiǎn)算的要簡(jiǎn)算.
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