题目内容
看谁算得准(能简算要简算).
(
+
)×8+
÷[
×(0.4+
)]
41×9.9+4.1.
(
5 |
8 |
2 |
27 |
11 |
27 |
9 |
20 |
3 |
2 |
4 |
5 |
41×9.9+4.1.
分析:先算括号,再算乘除,后算加减.能用运算定律的可以巧算.
解答:解:(
+
)×8+
=
×8+
×8+
=5+(
+
)
=6;
÷[
×(0.4+
)]
=
÷[
×
]
=
÷
=
;
41×9.9+4.1
=4.1×99+4.1
=4.1×(99+1)
=410.
5 |
8 |
2 |
27 |
11 |
27 |
=
5 |
8 |
2 |
27 |
11 |
27 |
=5+(
16 |
27 |
11 |
27 |
=6;
9 |
20 |
3 |
2 |
4 |
5 |
=
9 |
20 |
3 |
2 |
6 |
5 |
=
9 |
20 |
9 |
5 |
=
1 |
4 |
41×9.9+4.1
=4.1×99+4.1
=4.1×(99+1)
=410.
点评:按运算顺序计算,能巧算的可以巧算.
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