题目内容
计算下面各题.能简算的要简算.
![]() ![]() ![]() | ![]() ![]() | 375+450÷18×25 | ![]() ![]() ![]() |
解:
(1)
÷(3-
-
),
=
÷[3-(
+
)],
=
÷[3-1],
=
÷2,
=
;
(2)
×13+
×5,
=
×13+
×11,
=
×(13+11),
=
×24,
=10;
(3)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(4)
+
÷(4÷
),
=
+
÷6,
=
+
,
=1.
分析:(1)3连续减去
与
,等于减去
与
的和,最后算除法;
(2)根据乘法分配律进行简算;
(3)先算除法,再算乘法,最后算加法;
(4)先算小括号里面的除法,再算小括号外面的除法,最后算加法.
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.
(1)



=



=

=

=

(2)


=


=

=

=10;
(3)375+450÷18×25,
=375+25×25,
=375+625,
=1000;
(4)



=


=


=1.
分析:(1)3连续减去




(2)根据乘法分配律进行简算;
(3)先算除法,再算乘法,最后算加法;
(4)先算小括号里面的除法,再算小括号外面的除法,最后算加法.
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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