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计算题:能简算的要简算.2.5×3.2×12.5[334-(15+13)×4.5]÷0.6897×38-37.5%+104×0.375111139×1409999×2222+3333×3334(927+729)÷(57+59)

题目详情
计算题:能简算的要简算.
2.5×3.2×12.5[3
3
4
-( 
1
5
+
1
3
 )×4.5]÷0.6
897×
3
8
-37.5%+104×0.375     
 
111
139
×140
9999×2222+3333×3334       (9
2
7
+7
2
9
)÷(
5
7
+
5
9
▼优质解答
答案和解析
(1)2.5×3.2×12.5
=(2.5×4)×(0.8×12.5)
=10×10
=100

(2)[3
3
4
-( 
1
5
+
1
3
 )×4.5]÷0.6
=[3
3
4
-
1
5
×4.5-
1
3
×4.5]÷0.6
=[3
3
4
-0.9-1.5]÷0.6
=1.35÷0.6
=2.25

(3)897×
3
8
-37.5%+104×0.375  
=(897-1+104)×0.375  
=1000×0.375 
=375

(4)
111
139
×140
=
111
139
×(139+1)
=
111
139
×139+
111
139

=111+
111
139

=111
111
139


(5)9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=3333×10000
=33330000

(6)(9
2
7
+7
2
9
)÷(
5
7
+
5
9

=13×(
5
7
+
5
9
)÷(
5
7
+
5
9

=13×[(
5
7
+
5
9
)÷(
5
7
+
5
9
)]
=13×1
=13