问题 解答题
计算
19
40
+38)÷19
0.8+43×
4
5
+56×80%
9999×2222+3333×3334.
答案

19
40
+38)÷19

=(

19
40
+38)×
1
19

=

19
40
×
1
19
+38×
1
19

=

1
40
+2,

=2

1
40

(2)0.8+43×

4
5
+56×80%

=0.8+43×0.8+56×0.8,

=(1+43+56)×0.8,

=100×0.8,

=80;

(3)9999×2222+3333×3334

=3333×(3×2222)+3333×3334,.

=3333×6666+3333×3334,

=3333×(6666+3334),

=3333×10000,

=33330000.

单项选择题
单项选择题