题目内容
计算题
204×35-634
3.6-3.6÷0.9×0.8
6
÷[5.8÷(5.4-4
)]
(4.2+2
)÷[(21.74-
)×
]
(2
+
)÷(3
-3
)
204×35-634
3.6-3.6÷0.9×0.8
6
| 1 |
| 8 |
| 4 |
| 7 |
(4.2+2
| 1 |
| 4 |
| 6 |
| 25 |
| 2 |
| 3 |
(2
| 4 |
| 9 |
| 1 |
| 3 |
| 5 |
| 6 |
| 5 |
| 16 |
考点:分数的四则混合运算,整数四则混合运算,小数四则混合运算
专题:运算顺序及法则
分析:①先算乘法,再算减法;
②先算除法,再算乘法,最后算减法;
③先算小括号里面的减法,再算小括号外的除法,最后算中括号外的除法;
④先算小括号内的加法和减法,再算小括号外的乘法,最后算中括号外的除法;
⑤先算括号内的加法和减法,再算括号外的除法.
②先算除法,再算乘法,最后算减法;
③先算小括号里面的减法,再算小括号外的除法,最后算中括号外的除法;
④先算小括号内的加法和减法,再算小括号外的乘法,最后算中括号外的除法;
⑤先算括号内的加法和减法,再算括号外的除法.
解答:
解:①204×35-634
=7140-634
=6506
②3.6-3.6÷0.9×0.8
=3.6-4×0.8
=3.6-3.2
=0.4
③6
÷[5.8÷(5.4-4
)]
=
÷[5.8÷(
-
)]
=
÷[5.8÷(
-
)]
=
÷[5.8÷
]
=
÷[5.8×
]
=
÷7
=
×
=
④(4.2+2
)÷[(21.74-
)×
]
=(4.2+2.25)÷[(21.74-0.24)×
]
=6.45÷[21.5×
]
=6.45÷
=6.45×
=0.45
⑤(2
+
)÷(3
-3
)
=(2
+
)÷(
-
)
=2
÷(
-
)
=2
÷
=
×
=
=7140-634
=6506
②3.6-3.6÷0.9×0.8
=3.6-4×0.8
=3.6-3.2
=0.4
③6
| 1 |
| 8 |
| 4 |
| 7 |
=
| 49 |
| 8 |
| 7 |
| 5 |
| 4 |
| 7 |
=
| 49 |
| 8 |
| 49 |
| 35 |
| 20 |
| 35 |
=
| 49 |
| 8 |
| 29 |
| 35 |
=
| 49 |
| 8 |
| 35 |
| 29 |
=
| 49 |
| 8 |
=
| 49 |
| 8 |
| 1 |
| 7 |
=
| 7 |
| 8 |
④(4.2+2
| 1 |
| 4 |
| 6 |
| 25 |
| 2 |
| 3 |
=(4.2+2.25)÷[(21.74-0.24)×
| 2 |
| 3 |
=6.45÷[21.5×
| 2 |
| 3 |
=6.45÷
| 43 |
| 3 |
=6.45×
| 3 |
| 43 |
=0.45
⑤(2
| 4 |
| 9 |
| 1 |
| 3 |
| 5 |
| 6 |
| 5 |
| 16 |
=(2
| 4 |
| 9 |
| 3 |
| 9 |
| 5 |
| 6 |
| 5 |
| 16 |
=2
| 7 |
| 9 |
| 40 |
| 48 |
| 15 |
| 48 |
=2
| 7 |
| 9 |
| 25 |
| 48 |
=
| 25 |
| 9 |
| 48 |
| 25 |
=
| 16 |
| 3 |
点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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