-7+13-6+20= (-49)-(+91)-(-5)+(-9)= 1+(-2)+|-2-3|-5= (-5)x(-7)-5x(-6)=

-7+13-6+20= (-49)-(+91)-(-5)+(-9)= 1+(-2)+|-2-3|-5= (-5)x(-7)-5x(-6)=

题目
-7+13-6+20= (-49)-(+91)-(-5)+(-9)= 1+(-2)+|-2-3|-5= (-5)x(-7)-5x(-6)=
答案
-7+13-6+20
=(-7-6)+13+20
=20
(-49)-(+91)-(-5)+(-9)
=-49-91+5-9
=(-91-9)+(5-49)
=-100-44
=-144
1+(-2)+|-2-3|-5=
=1-2+5-5
=-1
(-5)x(-7)-5x(-6)
=35+30
=65
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