题目内容

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