Tim x:52/5+52/45+52/x.(x+4)=2010/2011
tính nhanh : 2010 x 2010 - 2009 x 2011
(456 x 11 +912) x 37 : (13 x 74 )
(44 x 52 x 60) : (11 x13 x 15 )
Giúp mk với ,bài khó quá ,mai mk đi học rùi
2010 x 2010 - 2009 x 2011
= ( 2011 - 2010 ) x 2010 - 2009 x 2011
= 2011 x 2010 - 1 x 2010 - 2009 x 2011
= 2011 x ( 2010 - 2009 ) - 1 x 2010
= 2011 x 1 - 2010
= 2011 - 2010
= 1
( 456 x 11 + 912 ) x 37 : ( 13 x 74 )
= ( 456 x 11 + 456 x 2 ) x 37 : ( 13 x 74 )
= [ 456 x ( 11 + 2 ) ] x 37 : ( 13 x 74 )
= [ 456 x 13 ] x 37 : ( 13 x 74 )
= 13 x 456 x 37 : ( 13 x 37 x 2 )
= 13 x 37 x 2 x 228 : ( 13 x 37 x 2 )
= ( 13 x 37 x 2 ) x 228 : ( 13 x 37 x 2 )
= ( 13 x 37 x 2 ) : ( 13 x 37 x 2 ) x 228
= 1 x 228
= 228
(44 x 52 x 60) : (11 x13 x 15 )
= [ ( 4 x 11 ) x ( 4 x 13 ) x ( 4 x 15 ) ] : (11 x13 x 15 )
= [ 4 x 11 x 4 x 13 x 4 x 15 ] : (11 x13 x 15 )
= [ ( 4 x 4 x 4 ) x ( 11 x 13 x 15 ) ] : (11 x13 x 15 )
= 64 x (11 x13 x 15 ) : (11 x13 x 15 )
= 64 x 1
= 64
a) 2010 x 2010 - 2009 x 2011
= 2010 x 2010 - [ 2009 x ( 2010 +1) ]
=2010 x 2010 - 2009 x 2010 - 2009
=2010( 2010 - 2009 ) -2009
= 2010 -2019
= 1
c) ( 44 x 52 x60 ) : (11x13x15)
\(\frac{44\cdot52\cdot60}{11\cdot13\cdot15}=\frac{4\cdot11\cdot4\cdot13\cdot4\cdot15}{11\cdot13\cdot15}=64\)
B) (456 x 11 +912) x 37 : ( 13 x 74 )
= \(\frac{\left(456\cdot11+912\right)\cdot37}{13\cdot74}=\frac{\left[456\left(11+2\right)\right]\cdot37}{13\cdot37}=\frac{456\cdot13}{13\cdot2}=\frac{456}{2}=228\)
Nhớ k mik nha bn
Tim x biet : (x+2)+(x+4)+.....+(x+52)=698
(x+2)+(x+4)+...+(x+52)=698
=>x.26+702=698
=>x=(698-702)/26
**** cho minh
mồi câu chỉ được cho 1 tich thôi đừng lừa
(x+2)+(x+4)+...+(x+52)=698
=>x.26+702=698
=>x=(698-702):26
tick nha
2010 : 15 + 131 x 52
(x+2)+x+4+x+6+x+8+X+50+X+52=1092 TIM x
x+2+x+4+x+6+x+8+x+50+x+52=1092
6x+122=1092
6x=1092-122
6x=970
x=970:6
x=485/3
Vậy x=485/3
ghi đúng hoặc sai
a. 2 phút 48 giây = 158 giây
b. tỉ số của 5 phần 2 là 2/5
c. 52 x ( 28 + 34 ) = 52 x 28 + 52 x 34
d. 46 dm2 > 4 m2 5 dm2
Tim X
a) 2(x-51)=2.23+20 b)32(x+4)-52=5.52
a) 2(x-51)=2.23+20 b)32(x+4)-52=5.52
2(x-51)=2.8+20 9(x+4)-25=125
2(x-51)=36 9(x+4)=125+25
x-51=36:2 9(x+4)=150
x-51=18 x+4= 150:9
x=18+51 x+4=50/9
x=69 x=14/9
Vậy:x=69 Vậy:x=14/9
Mik sai thì thôi nha!!!!
a) 2(x-51)=2.23+20 b)32(x+4)-52=5.52
2(x-51)=2.8+20 9(x+4)-25=125
2(x-51)=36 9(x+4)=125+25
x-51=36:2 9(x+4)=150
x-51=18 x+4= 150:9
x=18+51 x+4=50/9
x=69 x=4/9
Vậy:x=69 Vậy:x=4/9
Tim x biet : 75 % ×x + 3/4 =30; x+ 52 % =304 x× 10,01-x:100=74
a) 75% x X+ 3/4 = 30
75%x X= 30-3/4
75%x X=117/4
X=117/4 : 75/100
X=117/4 x 100/75
X= 39
tim x 52x-3-2×52 = 52×3
tim x 52x_3-2×52 = 52×3