题目内容
=
=
=
=
解:7
-(3
-2
),
=7
3
+2
,
=4+2
,
=6
;
(
)×12×13,
=
12×13
12×13,
=65+48,
=113;
39×
+148×
,
=39×
+74×
,
=(39+74)×
,
=113×(1
),
=113×1-113×
,
=113-
,
=112
;
(2
×3
-2
)÷2.75,
=2
×(3
)÷2.75,
=2.75×3÷2.75,
=8.25÷2.75,
=3.
分析:
,应用减法的运算性质进行简便计算;
,运用乘法分配律进行简便计算;
,运用乘法分配律进行简便计算;
,运用乘法分配律进行简便计算.
点评:此题主要考查分数四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律、运算性质进行简便计算.



=7



=4+2

=6

(

=


=65+48,
=113;
39×


=39×


=(39+74)×

=113×(1

=113×1-113×

=113-

=112

(2



=2


=2.75×3÷2.75,
=8.25÷2.75,
=3.
分析:




点评:此题主要考查分数四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律、运算性质进行简便计算.

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