题目内容
灵活计算,能简便计算的要简算
3.4×5.9+5.9×6.6 | 54+99×99+45 |
|
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)根据连减的性质进行计算.
(2)根据乘法分配律进行计算;
(3)根据连减的性质进行计算.
解答:解:
(1)3.4×5.9+5.9×6.6,
=(3.4+6.6)×5.9,
=10×5.9,
=59;
(2)54+99×99+45,
=(54+45)+99×99,
=99+99×99,
=99×(1+99),
=99×100,
=9900;
(3)
-(
+
),
=
-
-
,
=1-
,
=
.
(1)3.4×5.9+5.9×6.6,
=(3.4+6.6)×5.9,
=10×5.9,
=59;
(2)54+99×99+45,
=(54+45)+99×99,
=99+99×99,
=99×(1+99),
=99×100,
=9900;
(3)
11 |
9 |
2 |
9 |
3 |
5 |
=
11 |
9 |
2 |
9 |
3 |
5 |
=1-
3 |
5 |
=
2 |
5 |
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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