a+b-c+d=a+(b-c+d)
a-b-c+d=a-(b+c-d)
IV- bo`lim: Mustahkamlash
55-masala.
1) 4-3-7=-6 2) -4+(-9+11)=-2 3) (-a)+(-7b)+(1/3)c=-a-7b+(1/3)c
4) 2a+(-3b)-4c=2a-3b-4c
57-masala.
1) a-b+c=a+(-b)+c 2) 2+b-c=2+b+(-c)
3) a-2-b=a+(-2)+(-b) 4) 3+a-b-c=3+a+(-b)+(-c)
58-masala.
1) a+(2b-3c)= a+2b-3c 2) a-(2b-3c)= a-2b+3c
3) a-(2b+3c)= a-2b-3c 4) –(a-2b+3c)= -a+2b-3c
59-masala.
1) a+(b-(c-d))=a+b-c+d 2) a-(b-(c-d))=a-b+c-d
3) a-((b-c)-d)=a-b+c+d 4) a-(b+(c-(d-k)))=a-b-c+d-k
60-masala.
1) 3a-(a+2b)=3a-a-2b=2a-2b 2) 5x-(2y-3x)=5x-2y+3x=8x-2y
3) 3m-(5m-(2m-1))=3m-5m+2m-1=-1 4) 4a+(2a-(3a+3))=4a+2a-3a-3=3a-3
V- bo`lim: Darsda faol qatnashgan o`quvchilarni baholash.
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