thuc hien phep tinh :

a, (x+1)(1+x-x^2+x^3-x^4)-(x-1)(1+x+x^2+x^3+x^4)

b, (2b^2-2-5b+6b^3)(3+3b^2-b)

thuc hien phep tinh :

a, (x+1)(1+x-x^2+x^3-x^4)-(x-1)(1+x+x^2+x^3+x^4)

b, (2b^2-2-5b+6b^3)(3+3b^2-b)

thuc hien phep tru

(a-1)+(a-3)

(2+b)- (b+1) voi a,b thuoc z

KHI THUC HIEN PHEP TRU MOT SO TU NHIEN CHO 1 SO THAP PHAN CO 1 CHU SO PHAN THAP PHAN,BAN HUNG DA QUEN VIET DAU PHAY O SO TRU DAN DEN KET QUA SAI LA 433.TIM SO BI TRU,SO TRU TRONG PHEP TRU BIET KET QUA DUNG LA 671,5

Thu gọn biểu thức: 

     a) 2.( a-3b+5b) + (-3a-7c+5c) -4b         b)7.(-a-2b+c)+3.(-2c-6b+a)

     c)2.(-3c-6b+7b)-4.(2a-3b+8c)           d) -3.(2a+3b-4c)+7.(-2c+8a-2c)+20a+2a+24b

           e)-(5a-6b+c)+3.(-2c-6b+a)

thuc hien phep tinh

\(\frac{6}{7}+\frac{1}{7}.\frac{2}{7}+\frac{1}{7}.\frac{5}{7}\)

thuc hien phep tinh (Tinh nhanh neu co the)

(-5/12+7/4-3/8)-|4 va 1/2 -7 va 1/2|-( 1/4-5/2)

thuc hien cac phep tinh

1-2-3+4+5-6-7+...+2001-2002-2003+2004

Thuc hien phep tinh :

-4/7 . 2/5 + 6/7 . -3/10

Help me !!!! Thanks