题目内容
计算下列各题,能简算的要简算.
224÷[56×(38-37)] | 34×(12÷68) |
| ||
(45+14)÷73+710 | 1.5×7.4+0.6×150%+2÷
|
分析:(1)先算减法,再算乘法,最后算除法;
(2)先算除法,再算乘法;
(3)根据乘法分配律进行计算;
(4)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(5)根据乘法分配律进行计算.
(2)先算除法,再算乘法;
(3)根据乘法分配律进行计算;
(4)先算小括号里面的加法,再算除法,最后算括号外面的加法;
(5)根据乘法分配律进行计算.
解答:解:
(1)224÷[56×(38-37)],
=224÷[56×1],
=224÷56,
=4;
(2)34×(12÷68),
=34×
,
=6;
(3)
×38,
=
×(37+1),
=
×37+
×1,
=33+
,
=33
;
(4)(45+14)÷73+710,
=59÷73+710,
=
+710,
=710
;
(5)1.5×7.4+0.6×150%+2÷
,
=1.5×7.4+0.6×1.5+2×1.5,
=(7.4+0.6+2)×1.5,
=10×1.5,
=15.
(1)224÷[56×(38-37)],
=224÷[56×1],
=224÷56,
=4;
(2)34×(12÷68),
=34×
3 |
17 |
=6;
(3)
33 |
37 |
=
33 |
37 |
=
33 |
37 |
33 |
37 |
=33+
33 |
37 |
=33
33 |
37 |
(4)(45+14)÷73+710,
=59÷73+710,
=
59 |
73 |
=710
59 |
73 |
(5)1.5×7.4+0.6×150%+2÷
2 |
3 |
=1.5×7.4+0.6×1.5+2×1.5,
=(7.4+0.6+2)×1.5,
=10×1.5,
=15.
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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