210 : 25 + 32 . 22 - 43
315 - ( 5x + 80 ) = 155
1449 - { [ ( 216 + 184 ) : 8 ] . 9 }
A =4*5^2-2^8:2^6
B =1449-{[(216+184):8]*9}
24:{300:[375-(150+15.5)]}
1449:[(216+184):8].9
222+224+226+.....+444
127.36+64.127-127.100
a, \(24:\left\{300:\left[375-\left(150+15.5\right)\right]\right\}\)
\(=24:\left\{300:\left[375-\left(150+325\right)\right]\right\}\)
\(=24:\left\{300:\left[375-225\right]\right\}\)
\(=24:\left\{300:150\right\}\)
\(=24:2=12\)
b, \(1449:\left[\left(216+184\right):8\right].9\)
\(=1449:\left[400:8\right].9\)
\(=1449:50.9\)
\(=28,98.9=260,82\)
c, \(222+224+......+444\)
\(=\dfrac{\left[\left(444-222\right):2+1\right]\left(444+222\right)}{2}\)
\(=37264\)
d, \(127.36+64.127-127.100\)
\(=127\left(36+64-100\right)\)
\(=127.0=0\)
24:\(\left\{300:\left[375-\left(150+15.5\right)\right]\right\}\)
=24:\(\left\{300:\left[375-15.\left(10-5\right)\right]\right\}\)
=24:\(\left\{300:\left[15.25-15.5\right]\right\}\)
=24:\(\left\{300:\left[15.\left(25-5\right)\right]\right\}\)
=24:\(\left\{300:\left[15.20\right]\right\}\)
=24:\(\left\{300:300\right\}\)
=24:1=24
1449:\(\left[\left(216+184\right):8\right].9\)
=1449:(400:8).9
=1449:50.9
=28,98.9=260,82
Giải nhanh
1449- {(216+184)x 8)x9}
muốn giải nhanh thì bấm máy tính đi
a.(456*11+912)*37/13/74
b.[(315+372)*3+(372+315)*7]/(26*13+74.14)
c.12/{390/[500-(125+35*7)]}
d.12000-(1500*2+1800*3+1800*2/3)
e.127*36+64*127-27*100
h.2*125*18+36*252+4*223*9
i.50+51+51+...+99+100
j.24/{300/[375-(150+15*5)]}
k.1449/{[216+184/8).9]}
l.2195*1952-1952*427-1952*1768
m.20+22+24+...+96+98
n.35+38+41+...+92+95
o.{46-[(16+71*4)/15]}-2
p.222+224+226+...+444
q.(5346-2808)/54+51
r.187*(38+62)-87*(62+38)
s.25*{32/[12-4+4*(16/8)]}
mọi người giúp mình với nhé!làm cả cách các bạn giải như thế nào nhé!
315-(5x + 80) = 155
=> 5x + 80 = 315 - 155
=> 5x + 80 = 160
=> 5x = 160 - 80
=> 5x = 80
=> x = 80 : 5
=> x = 16
315-(5x+80)=155
5x+80=315-155
5x+80=160
5x=160-80
5x=80
x=80:5
x=16
Đinh Tuấn Việt làm nhanh hơn bạn 2 giây mà Minh Hậu
315-(5x + 80) = 155
= ( 5x + 80 ) = 315 - 155
= ( 5x + 80 ) = 160
= 5x =160 - 80
= 5x = 80
= x = 80 : 5
= x 16
Thực hiện phép tính:
a) 23.3-(110+8):32
b) 1449-{[(216+184):8].9}
c) 342.163+337.342-103.171
d) (13.1714+4.1714):1713-(14.9-14.5):8
b) 1449 - {[(216 + 184) : 8] . 9}
= 1449 - {[400 : 8] : 9}
= 1449 - {50 : 9}
= 1449 - \(\frac{50}{9}\)
= \(\frac{12991}{9}\)
c) 342 . 163 + 337 . 342 - 103 . 171
= 342 . (163 + 337) - 1000 . 171
= 342 . 500 - 500 . 2 . 171
= 500 . (342 - 2 - 171)
= 500 . 169
= 84500
d) (13 . 1714 + 4 . 1714) : 1713 - (14 . 9 - 14 . 5) : 8
= [1714 . (13 + 4)] : 1713 - [14 . (9 - 5)] : 8
= [1714 . 17] : 1713 - [14 . 4] : 8
= 1715 : 1713 - 56 : 8
= 172 - 56 : 8
= 172 - 7
= 289 - 7
= 282
thực hiện phép tính
24:{ 300:[375(150+15.5)]}
1449-[216-184:8).9]
56 : 53 + 3. 32
1449-[216-184:8).9]
=1449-[216-23).9]
=1449-(193.9)
=1449-1737
=-288
24 : { 300 : [ 375 ( 150 + 15 . 5 ) ] }
24 : { 300 : [ 375 ( 150 + 75 ) ] }
24 : [ 300 : ( 375 . 225 ) ]
24 : ( 300 : 84375 )
24 : 4/1125
= 6750
Tìm x, biết:
a) 210 – 5.x = 200;
b) 210 : x – 10 = 20;
c) 210 – 5.( x – 10) =200;
d) (2x + l):7 = 22+32;
e) 450:[41–(2x–5)] = 32.5;
f) (5x – 39).7 + 3 = 80.
a) x = 2
b) x = 7.
c) x = 12
d) x = 45
e) x = 18.
f) x = 10