问题 解答题
怎样简便就怎样算.
4.27÷0.7×1.318.9-18.9÷1.40.25×408
0.25×1.25×160.4×99+0.412.5×1.7+8.3×12.5.
答案

(1)4.27÷0.7×1.3,

=6.1×1.3,

=7.93;

(2)18.9-18.9÷1.4,

=18.9-13.5,

=5.4;

(3)0.25×408,

=0.25×(4×102),

=(0.25×4)×102,

=1×102,

=102;

(4)0.25×1.25×16,

=0.25×1.25×(2×8),

=(0.25×2)×(1.25×8),

=0.5×10,

=5;

(5)0.4×99+0.4,

=0.4×(99+1),

=0.4×100,

=40;

(6)12.5×1.7+8.3×12.5,

=12.5×(1.7+8.3),

=12.5×10,

=125.

单项选择题
单项选择题