| 5.17+1.96+4.83= | 12.5×0.34×8= | 5.01×101-5.01= | ﹙ - )× = | 5×( )×6= |
=(5.17+4.83)+1.96,
=10+1.96,
=11.96;
(2)12.5×0.34×8,
=12.5×8×0.34,
=100×0.34,
=34;
(3)5.01×101-5.01,
=5.01×(101-1),
=5.01×100,
=501;
(4)﹙
-
)×
,=
×
,=
;(5)5×(
)×6,=(5×6)×(
),=5×6×
-5×6×
,=5×
×6-6×
×5,=1×6-1×5,
=6-5,
=1.
分析:(1)运用加法交换律简算;
(2)运用乘法交换律简算;
(3)运用乘法分配律简算;
(4)先算小括号里面的减法,再算括号外的乘法;
(5)先把5×6结合在一起,然后运用乘法分配律和乘法结合律简算.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.