题目内容
脱式计算(能简算的要简算)
70.9-48.32÷1.6 | ()×36 | ÷[()×] | ×23+16××60. |
解:
(1)70.9-48.32÷1.6,
=70.9-30.2,
=40.7;
(2)()×36,
=×36-×36,
=4-3,
=1;
(3)÷[()×],
=÷[×],
=÷,
=;
(4)×23+16××60,
=×92+16××60,
=×(92+16+60),
=×168,
=24.
分析:(1)先算除法,再算减法;
(2)根据乘法分配律进行计算;
(3)先算加法,再算乘法,最后算除法;
(4)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)70.9-48.32÷1.6,
=70.9-30.2,
=40.7;
(2)()×36,
=×36-×36,
=4-3,
=1;
(3)÷[()×],
=÷[×],
=÷,
=;
(4)×23+16××60,
=×92+16××60,
=×(92+16+60),
=×168,
=24.
分析:(1)先算除法,再算减法;
(2)根据乘法分配律进行计算;
(3)先算加法,再算乘法,最后算除法;
(4)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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