问题 解答题
计算下面各题,能简算的要简算.
102×4.57.8×6.9+2.2×6.95.6×1.25.
答案

(1)102×4.5,

=(100+2)×4.5,

=100×4.5+2×4.5,

=450+9,

=459;

(2)7.8×6.9+2.2×6.9,

=6.9×(7.8+2.2),

=6.9×10,

=69;

(3)5.6×1.25,

=0.7×(8×1.25),

=0.7×10,

=7.

单项选择题
单项选择题