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÷. |
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.
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.
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)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.
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.
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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