Cho H3^ =50* ,Q2^=130* Chứng minh các cặp góc so le trong = nhau

a)-3/5.5/7+3/-5.3/7+3/5.-6/7

b)3/13:-11/-6+-3/13:11/-5-2/13
c)1/2.(x+2)+3/8=7/16
d)1/3x+2/5(x+1)=0
-1/3+5/2x=1/6:(-2/9)
 

-(23/55+17/20)+(7/20-2/11)-1/-2

Bài 1:

a)-3/5.-1/2
b)-4/7.2/3
c)-333/151.-302/111
d)-147.1/7

Bài 2 :1/1.1/2+1/2.1/3+1/3.1/4+....+1/998.1/999+1/999.1/1000

Toán 6 

Giai đơn giản và đầy đủ nhé.TKS

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