题目内容
计算.(能简便的用简便方法计算)
①3.9×3.6+3.9×6.4
②(1-
+
)×24
③
+(
-
)÷
④
÷[(
-
)÷
].
①3.9×3.6+3.9×6.4
②(1-
1 |
3 |
1 |
4 |
③
5 |
16 |
7 |
16 |
1 |
4 |
1 |
2 |
④
4 |
5 |
5 |
8 |
1 |
2 |
5 |
8 |
分析:①根据乘法分配律进行计算;
②根据乘法分配律进行计算
③先算减法,再算除法,最后算加法;
④先算小括号里面的减法,再算中括号里面的除法,最后算括号外面的除法.
②根据乘法分配律进行计算
③先算减法,再算除法,最后算加法;
④先算小括号里面的减法,再算中括号里面的除法,最后算括号外面的除法.
解答:解:
①3.9×3.6+3.9×6.4,
=3.9×(3.6+6.4),
=3.9×10,
=39;
②(1-
+
)×24,
=1×24-
×24+
×24,
=24-8+6,
=16+6,
=22;
③
+(
-
)÷
,
=
+
÷
,
=
+
,
=
;
④
÷[(
-
)÷
],
=
÷[
÷
],
=
÷
,
=4.
①3.9×3.6+3.9×6.4,
=3.9×(3.6+6.4),
=3.9×10,
=39;
②(1-
1 |
3 |
1 |
4 |
=1×24-
1 |
3 |
1 |
4 |
=24-8+6,
=16+6,
=22;
③
5 |
16 |
7 |
16 |
1 |
4 |
1 |
2 |
=
5 |
16 |
3 |
16 |
1 |
2 |
=
5 |
16 |
3 |
8 |
=
11 |
16 |
④
4 |
5 |
5 |
8 |
1 |
2 |
5 |
8 |
=
4 |
5 |
1 |
8 |
5 |
8 |
=
4 |
5 |
1 |
5 |
=4.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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