这些算式都要过程·没过程的不要进啊···-14-15 -2/5-(2/5)(-2/3)-1/12-(-1/4)21-(-74)-32-(-97)

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这些算式都要过程·没过程的不要进啊···-14-15 -2/5-(2/5)(-2/3)-1/12-(-1/4)21-(-74)-32-(-97)

这些算式都要过程·没过程的不要进啊···-14-15 -2/5-(2/5)(-2/3)-1/12-(-1/4)21-(-74)-32-(-97)
这些算式都要过程·没过程的不要进啊···
-14-15
-2/5-(2/5)
(-2/3)-1/12-(-1/4)
21-(-74)-32-(-97)

这些算式都要过程·没过程的不要进啊···-14-15 -2/5-(2/5)(-2/3)-1/12-(-1/4)21-(-74)-32-(-97)
-14-15
=-14+(-15)
=-(14+15)
=-29
-2/5-(2/5)
=-2/5+(-2/5)
=-(2/5+2/5)
=-4/5
(-2/3)-1/12-(-1/4)
=(-2/3)+(-1/12)+1/4
=-(2/3+1/12)+1/4
=-3/4+1/4
=-(3/4-1/4)
=-1/2
21-(-74)-32-(-97)
=21+74-32+97
=95-32+97
=63+97
=160

-14-15=-14+(-15)=-(14+15)=-29
-2/5-2/5=-2/5+(-2/5)=-(2/5+2/5)=-4/5
(-2/3)-1/12-(-1/4)=(-2/3)+(-1/12)+1/4=-(2/3+1/12)+1/4=-3/4+1/4=-(3/4-1/4)=-1/2
21-(-74)-32-(-97)=21+74-32+97=95-32+97=63+97=160

-14-15=-(14+15)=-29
-(2/5)-(2/5)=-(2/5+2/5)=-4/5
-2/3-(1/12)-(1/4)=-(8/12+1/12+3/12)=-1
21-(-74)-32-(-97)=21+74+32+97=234

1. -14-15=-(14+15)=-29
2. -(2/5)-(2/5)=-(2/5+2/5)=-4/5

3. -2/3-(1/12)-(1/4)=-8/12-(1/12)-(3/12)=-(8/12+1/12+3/12)=-1
4. 21-(-74)-32-(-97)=21+74-32+97=160