问题 解答题
用递等式计算.
600-(4.06+6.4)×0.5 
3.69×7.5+36.9×0.25.
答案

(1)600-(4.06+6.4)×0.5,

=600-10.46×0.5,

=600-5.23,

=594.77;

(2)3.69×7.5+36.9×0.25,

=3.69×7.5+3.69×2.5,

=3.69×(7.5+2.5),

=3.69×10,

=36.9.

单项选择题
单项选择题