36*(1/2+1/3-1/4) 0.4*(2.5/75) 2013*1/2014+1/2014简便运算1/2x-4*0.25=1.25解方程

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36*(1/2+1/3-1/4)0.4*(2.5/75)2013*1/2014+1/2014简便运算1/2x-4*0.25=1.25解方程36*(1/2+1/3-1/4)0.4*(2.5/75)201

36*(1/2+1/3-1/4) 0.4*(2.5/75) 2013*1/2014+1/2014简便运算1/2x-4*0.25=1.25解方程
36*(1/2+1/3-1/4) 0.4*(2.5/75) 2013*1/2014+1/2014简便运算
1/2x-4*0.25=1.25解方程

36*(1/2+1/3-1/4) 0.4*(2.5/75) 2013*1/2014+1/2014简便运算1/2x-4*0.25=1.25解方程
收起
36*(1/2+1/3-1/4)
=36×1/2+36×1/3-36×1/4
=18+12-9
=21;
0.4*(2.5/75)
=1/75;
2013*1/2014+1/2014简便运算
=(2013+1)/2014
=2014/2014
=1;
happ5468654
1/2x-4*0.25=1.25解方程
x/2=2.25;
x=4.5;
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中间的加减号呢?

36*(1/2+1/3-1/4)
=36*1/2+36*1/3-36*1/4
=18+12-9=21
0.4*(2.5/75)
=0.4*2.5/75
=1/75
2013*1/2014+1/2014
=(2013+1)/2014
=2014/2014
=1
1/2*x-4*0.25=1.25
1/2*x=1+1.25
1/2*x=2.25
x=4.5

简便运算
36*(1/2+1/3-1/4)
解,得:
==36*1/2+36*1/3-36*1/4
==18+12-9
==21


0.4*(2.5/75)
解,得:
==0.4*2.5/75
==1/75



2013*1/2014+1/2014
解,...

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简便运算
36*(1/2+1/3-1/4)
解,得:
==36*1/2+36*1/3-36*1/4
==18+12-9
==21


0.4*(2.5/75)
解,得:
==0.4*2.5/75
==1/75



2013*1/2014+1/2014
解,得:
==(2013+1)*1/2014
==2014*(1/2014)
==1



1/2x-4*0.25=1.25解方程
解,得
1-2x==2.5x
-2x-2.5x==-1
4.5x==1
x==2/9

收起

36x(1/2+1/3-1/4)
=36x1/2+36x1/3-36x1/4
=18+12-9
=21
0.4×(25/75)
=1/75
2013×1/2014+1/2014的简便运算
=(2013+1)/2014
=2014/2014
=1
1/2×x-4x0.25
1/2xx=1+1.25
1/xx=2.25
x=4.5