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我会用简便方法计算.25+3.56+135+6.441118×67+718÷7619.9+19.9×99.
题目详情
我会用简便方法计算.
+3.56+1
+6.44
×
+
÷
19.9+19.9×99.
2 |
5 |
3 |
5 |
11 |
18 |
6 |
7 |
7 |
18 |
7 |
6 |
19.9+19.9×99.
▼优质解答
答案和解析
(1)
+3.56+1
+6.44
=
+1
+(3.56+6.44)
=2+10
=12
(2)
×
+
÷
=
×
+
×
=(
+
)×
=1×
=
(3)19.9+19.9×99
=(1+99)×19.9
=100×19.9
=1990
2 |
5 |
3 |
5 |
=
2 |
5 |
3 |
5 |
=2+10
=12
(2)
11 |
18 |
6 |
7 |
7 |
18 |
7 |
6 |
=
11 |
18 |
6 |
7 |
7 |
18 |
6 |
7 |
=(
11 |
18 |
7 |
18 |
6 |
7 |
=1×
6 |
7 |
=
6 |
7 |
(3)19.9+19.9×99
=(1+99)×19.9
=100×19.9
=1990
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