四道计算,要结果.
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四道计算,要结果.
![](http://img.wesiedu.com/upload/6/69/66941abfd91f1e1fb4cf367840df21f2.jpg)
![](http://img.wesiedu.com/upload/6/69/66941abfd91f1e1fb4cf367840df21f2.jpg)
![四道计算,要结果.](/uploads/image/z/14018073-33-3.jpg?t=%E5%9B%9B%E9%81%93%E8%AE%A1%E7%AE%97%2C%E8%A6%81%E7%BB%93%E6%9E%9C.%26nbsp%3B)
(5--3.9x2/3)除以4.2除以[1/6--1/7)x(4/5)]
=(5--2.6)x(1/4.2)除以[(1/42)x(4/5)]
=(2.4/4.2)除以(2/105)
=(4/7)x(105/2)
=30.
(4.3+2.1x6又7分之4)除以1又5分之4
=[(43/10)+(21/10)x(46/7)]x(5/9)
=[(43/10+(138/10)]x(5/9)
=(181/10)x(5/9)
=181/18.
原式=199+199x6.6+2.4x199
=199x(1+6.6+2.4)
=199x10
=1990.
原式=4.6x5.9+4.6x3.1+4.6
=4.6x(5.9+3.1+1)
=4.6x10
=46.
=(5--2.6)x(1/4.2)除以[(1/42)x(4/5)]
=(2.4/4.2)除以(2/105)
=(4/7)x(105/2)
=30.
(4.3+2.1x6又7分之4)除以1又5分之4
=[(43/10)+(21/10)x(46/7)]x(5/9)
=[(43/10+(138/10)]x(5/9)
=(181/10)x(5/9)
=181/18.
原式=199+199x6.6+2.4x199
=199x(1+6.6+2.4)
=199x10
=1990.
原式=4.6x5.9+4.6x3.1+4.6
=4.6x(5.9+3.1+1)
=4.6x10
=46.