问题 解答题
选择最适合的方法,写出递等式计算的过程
39.6-6.53+3.47.0.0125×32×0.25.[90-(8.25÷0.6+1.25)]×0.01.
38×2.5+76+38×5.5.3.6×31.4+43.9×6.4.5.7×5.7+5.7×4.2+5.7×0.1.
答案

(1)39.6-6.53+3.47,

=33.07+3.47,

=36.54;

(2)0.0125×32×0.25,

=0.0125×8×4×0.25,

=(0.0125×8)×(4×0.25),

=0.1×1,

=0.1;

(3)[90-(8.25÷0.6+1.25)]×0.01,

=[90-(13.75+1.25)]×0.01,

=[90-15]×0.01,

=75×0.01,

=0.75;

(4)38×2.5+76+38×5.5,

=38×2.5+38×2+38×5.5,

=38×(2.5+2+5.5),

=38×10,

=380;

(5)3.6×31.4+43.9×6.4,

=113.04+280.96,

=394;

(6)5.7×5.7+5.7×4.2+5.7×0.1,

=5.7×(5.7+4.2+0.1),

=5.7×10,

=57.

单项选择题
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