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用简便方法计算.87×10167+79+87+2913.55-3.76+5.45-7.2424×(512+124+38)

题目详情
用简便方法计算.
87×101
6
7
+
7
9
+
8
7
+
2
9
13.55-3.76+5.45-7.24 24×(
5
12
+
1
24
+
3
8
▼优质解答
答案和解析
(1)87×101,
=87×(100+1),
=87×100+87,
=8700+87,
=8787;

(2)
6
7
+
7
9
+
8
7
+
2
9

=(
6
7
+
8
7
)+(
7
9
+
2
9
),
=2+1,
=3;

(3)13.55-3.76+5.45-7.24,
=(13.55+5.45)-(3.76+7.24),
=19-11,
=8;

(4)24×(
5
12
+
1
24
+
3
8
),
=24×
5
12
+24×
1
24
+24×
3
8

=10+1+9,
=20.