问题 填空题

当a=0.8,b=1.2,a+0.7=______;ab=______;4a+5b=______.

答案

当a=0.8,b=1.2时,

a+0.7,

=0.8+0.7,

=1.5;

ab,

=0.8×1.2,

=0.96;

4a+5b,

=4×0.8+5×1.2,

=3.2+6,

=9.2.

故答案为:1.5;0.96;9.2.

单项选择题
单项选择题