36× -![]() | + ÷![]() | 6.28×3.7+6.28×6.3 |
+ ×9+![]() | 80.8×10.1-8.08 | - × . |
-
,=(36-1)×

=35×
,=18;
(2)
+
÷
,=
+
,=
;(3)6.28×3.7+6.28×6.3,
=6.28×(3.7+6.3),
=6.28×10,
=62.8;
(4)
+
×9+
,=
+
+
,=
+(
+
),=
+1,=1
;(5)80.8×10.1-8.08,
=8.08×101-8.08,
=8.08×(101-1),
=8.08×100,
=808;
(6)
-
×
,=
×(1-
),=
×
,=
.分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算加法;
(3)根据乘法分配律进行简算;
(4)先算乘法,再根据加法结合律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.
点评:考查了运算定律与简便运算,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律简便计算.