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(2011•郑州模拟)能简算的要简算:(1)432×99-568(2)1429÷4-(3+5÷9)(3)51×68×78÷(17×34×13)(4)1417×(223-0.75)+1512÷1721.
题目详情
(2011•郑州模拟)能简算的要简算:
(1)432×99-568
(2)14
÷4-(3+5÷9)
(3)51×68×78÷(17×34×13)
(4)1
×(2
-0.75)+15
÷
.
(1)432×99-568
(2)14
2 |
9 |
(3)51×68×78÷(17×34×13)
(4)1
4 |
17 |
2 |
3 |
1 |
2 |
17 |
21 |
▼优质解答
答案和解析
(1)432×99-568
=432×(100-1)-568,
=432×100-432-568,
=43200-(432+568),
=43200-1000,
=42200;
(2)14
÷4-(3+5÷9)
=
×
-(3+
),
=
-
,
=0;
(3)51×68×78÷(17×34×13)
=51×68×78÷17÷34÷13,
=(51÷17)×(68÷34)×(78÷13),
=3×2×6,
=36;
(4)1
×(2
-0.75)+15
÷
.
=
×(
-
)+
×
,
=
×
+
×
,
=(
+
)×
,
=(
+
)×
,
=
×
,
=
.
=432×(100-1)-568,
=432×100-432-568,
=43200-(432+568),
=43200-1000,
=42200;
(2)14
2 |
9 |
=
128 |
9 |
1 |
4 |
5 |
9 |
=
32 |
9 |
32 |
9 |
=0;
(3)51×68×78÷(17×34×13)
=51×68×78÷17÷34÷13,
=(51÷17)×(68÷34)×(78÷13),
=3×2×6,
=36;
(4)1
4 |
17 |
2 |
3 |
1 |
2 |
17 |
21 |
=
21 |
17 |
8 |
3 |
3 |
4 |
31 |
2 |
21 |
17 |
=
21 |
17 |
23 |
12 |
31 |
2 |
21 |
17 |
=(
23 |
12 |
31 |
2 |
21 |
17 |
=(
23 |
12 |
186 |
12 |
21 |
17 |
=
209 |
12 |
21 |
17 |
=
1463 |
68 |
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