tinh : \(A=\left(20,07+2008.20,09\right).\left(2011.0,1-20,11\right)\)
tisnh A =(20,07+2008.20,09).(20,11.0,01-20,11)
tính A=(20,07+2008.20,09).(2011.0,01-20,11)
Tính A= (20,07+2008.20,09) . (2011.0,01.20,11)
A=(20,07+2008x20,09)x(2011x0,01-20,11)
A=(20,07+2008x20,09)x(2011x0,01-20,11)
A=
(20,07+2008x20,09)x(20,11-20,11)
A=
(20,07+2008x20,09)x0
A=0
tính A=(20,07+2008x20,09)x(2011x0,01-20,11)
A=(20,07+2008x20,09)x(2011x0,01-20,11)
a=40360,79x0=0
vạy A=0
A=(20,07+2008x20,09)x(2011x0,01-20,11)
Giải
Vì theo quy tắc nhân chia trước cộng trừ sau nên ta có:
A=(20,07+40340,72)x(20,11-20,11)
A= 40360,79x0
A= 0
mình tán thành với ý kiến của 2 bạn trên
đáp án =0
chúc bn học tốt
tính a ( 20,07+2008x20,09)x(20,11x0,01-20,11)
tính A = (20,07+2008.0,09).(2011.0,01-20,11)
=[20,07+2008.0,09].[20,11-20,11]
=[20,07+2008.0,09].0
=0
E= \(\frac{a^3}{\left(a-b\right)\left(a-c\right)}+\frac{b^3}{\left(b-a\right)\left(b-c\right)}+\frac{c^3}{\left(c-a\right)\left(c-b\right)}\) thuwcj hien phep tinh a
cho a,b,c khac nhau tung doi mot. Tinh
\(P=\frac{a^2}{\left(a-b\right)\left(a-c\right)}+\frac{b^2}{\left(b-c\right)\left(b-a\right)}+\frac{c^2}{\left(c-b\right)\left(c-a\right)}\)
\(P=\frac{a^2}{\left(a-b\right)\left(a-c\right)}+\frac{b^2}{\left(b-c\right)\left(b-a\right)}+\frac{c^2}{\left(c-b\right)\left(c-a\right)}\)
\(=\frac{-a^2}{\left(a-b\right)\left(c-a\right)}+\frac{-b^2}{\left(b-c\right)\left(a-b\right)}+\frac{-c^2}{\left(b-c\right)\left(c-a\right)}\)
\(=\frac{\left(-a^2\right)\left(b-c\right)}{\left(a-b\right)\left(b-c\right)\left(c-a\right)}+\frac{\left(-b^2\right)\left(c-a\right)}{\left(a-b\right)\left(b-c\right)\left(c-a\right)}+\frac{\left(-c^2\right)\left(a-b\right)}{\left(a-b\right)\left(b-c\right)\left(c-a\right)}\)
\(=\frac{-a^2b+ca^2-b^2c+ab^2-c^2a+bc^2}{-a^2b-c^2a+ca^2-b^2c+ab^2+bc^2}=1\)
Vậy \(P=1.\)