− 167 . − 83 + 167.17 − 33 = 167.83 + 167.17 − 33 = 167. 83 + 17 − 33 = 167.100 − 33 = 1667

a) 2.(-25).(-4).50 = 10000

b) 16.50.(-25).(-250) = 5000000

c)

− 167 . − 83 + 167.17 − 33 = 167.83 + 167.17 − 33 = 167. 83 + 17 − 33 = 167.100 − 33 = 1667

d) 

135 − 35 .47 − 53. − 48 − 52 = 100.47 − 53. − 100 = 100.47 + 53.100 = 100. 47 + 53 = 100.100 = 10000

a)  2. − 25 . − 4 .50 = 10000

b)  16.50. − 25 . − 250 = 5000000

c) 

− 167 . − 83 + 167.17 − 33 = 167.83 + 167.17 − 33 = 167. 83 + 17 − 33 = 167.100 − 33 = 1667

d) 

135 − 35 .47 − 53. − 48 − 52 = 100.47 − 53. − 100 = 100.47 + 53.100 = 100. 47 + 53 = 100.100 = 10000

\(-167.83+167.\left(-17\right)-33\)

\(=-167.83+\left(-167\right).17-33\)

\(=-167.\left(83+17\right)-33\)

\(=-167.100-33\)

\(=-16700-33=-16733\)

( -167 ) . 83 + 167 . ( - 17 ) - 33

= ( -167 ) . 83 + ( -167 ) . 17 - 33

= ( -167 ) . ( 83 + 17 ) - 33

= -167 . 100 - 33

= -16700 - 33

= -16733

( -167 ) x 83 + 167 x ( - 17 ) - 33 \(=167.\left(-83+-17\right)-33\)

\(=167.\left(-100\right)-33\)

\(=-16700-33=-16733\)

HTDT

a=1

b=400

c=-500

a) - 287+ 499+ (- 499)+ 285 

= ( - 287 + 285 ) + [ 499 + ( - 499 ) ]

= -2 + 0 = -2

b) ( 326- 43) + ( 174- 57)

= 326 - 43 + 174 - 57

= ( 326 + 174 ) - ( 43 + 57 )

=  500 - 100

= 400

c) ( 351- 875) - ( 125 - 149)

= 351 - 875 - 125 + 149

= ( 351 + 149 ) - ( 875 + 125)

= 500 - 1000

=  - 500

d) (-8) . 25 .(-2) .4 (-5) .125

= [ ( - 8 ) . 125 ] . (25 . 4) . [( - 2) . ( - 5)

= 1000 .100 . 10

= 1000000

e) (-167). 83+ 167. (-17) -33

= 167 . [ ( - 83 ) + ( - 17) ] - 33

= 167 . ( - 100) -33

= - 16700 -33

= - 16733

g) (- 284). 172+ (-284). (-72)

= ( - 284 ) . ( 172 - 72)

= - 284 . 100

= - 28400

~ Học tốt

# Chiyuki Fujito

Tính nhanh :

= -167 x 83 + (-167) x 17 - 33

= (-167) x (83+17) - 33

= (-167) x 100 - 33

= -16700-33 = -16733

Tìm x :

a, => 49-x^2=0 ( vì x^2+1 > 0 )

=> x^2=49

=> x=7 hoặc x=-7

b, => 3-x=0 hoặc 8-x=0

=> x=3 hoặc x=8

c, => x+2=0 hoặc x-3=0

=> x=-2 hoặc x=3

Tk mk nha

t làm Ngếu Ngáo câu A. đúng thì đúng mà sai thi thôi nhé 

(-100-67) x (80+3)+(100+67) x(-10-7)-33   ( phá ngoặc)

\(-100-67\times80+3+100+67\times\left(-10\right)-7-33\) ( rút gọn)

\(\left(80+3-40\right)\times\left(-10\right)\) ( tính ) 

\(43\times\left(-10\right)=-430\)

ko biêt đúng hay sai đâu kk 

\(\left(-167\right).83+167.\left(-17\right)-33\)

\(=167.\left(-83-17\right)-33\)

\(=167.\left(-100\right)-33\)

\(=-16700-33\)

\(=-16733\)

\(\left(x^2+1\right)\left(49-x^2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x^2+1=0\\49-x^2=0\end{cases}}\Rightarrow\orbr{\begin{cases}x^2=-1\\x^2=49\end{cases}}\Rightarrow\orbr{\begin{cases}x\in\varnothing\\x=\pm7\end{cases}}\)

vậy \(x=\pm7\)

\(\left(3-x\right)\left(8-x\right)>0\)

\(\Leftrightarrow\hept{\begin{cases}3-x>0\\8-x>0\end{cases}}\) hoặc \(\hept{\begin{cases}3-x< 0\\8-x< 0\end{cases}}\)

\(\Leftrightarrow\hept{\begin{cases}-x>-3\\-x>-8\end{cases}}\)hoặc \(\hept{\begin{cases}-x< -3\\-x< -8\end{cases}}\)

\(\Leftrightarrow\hept{\begin{cases}x< 3\\x< 8\end{cases}}\) hoặc \(\hept{\begin{cases}x>3\\x>8\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x< 3\\x>8\end{cases}}\)

vậy \(\orbr{\begin{cases}x< 3\\x>8\end{cases}}\)

\(x+xy+x=9\)

\(2x+xy=9\)

\(x\left(y+2\right)-9=0\)

ko biet giai

=[(-167)+167].83

=0.83=0

(-167).83+167

=167.(-83)+167

=167.(-83+1)

=167.(-82)

=-13694

a: \(\left[\left(-59\right)+71\right]-\left[\left(-83\right)-\left(-95\right)\right]\)

\(=\left[71-59\right]-\left[-83+95\right]\)
=12-12

=0

b: \(\left(435-167-89\right)-\left(435-89\right)\)

\(=435-167-89-435+89\)

\(=\left(435-435\right)+\left(89-89\right)-167\)

=0+0-167

=-167

c: \(\left(-624\right)-\left[\left(376+245\right)-45\right]\)

\(=\left(-624\right)-\left[376+245-45\right]\)

\(=\left(-624\right)-376-200\)

=-1000-200

=-1200