tinh nhanh
a 12-13+14-15+16
b 125*12+12*874+12
c, 456*45+456*10-456*55
d, 1475+399-475-199
a). 125 x 12 + 12 x 874 + 12
b). 34,64 x 46 + 34,64 x 53 + 34,64 c). 456 x 45 + 456 x 10 – 456 x 55
d).1475+399-475-199
A, 345 – 35 – 10
B, 735 + 243 – 135 – 143
C, 18 – 16 + 14 – 12 + 10 – 8
D, 125 x 12 + 12 x 874 + 12
E, 456 x 45 + 456 x 10 – 456 x 55
G, 1475+399-475-199
H, (1+3+5+7+9+11+13+15) : (32 x 2)
N, (24 x 6 + 4 x 24) : (49 – 24 x 2)
M, (1+2+3+…..+98+99+100) : 5050
P, 25 x 14 x 4
O, 2 x 36 x 50
A=300
B=700
C=6
D=12000
E=0
G=1200
H=1
N=240
M=1
P=1400
O=3600
a). 125 x 12 + 12 x 874 + 12
b). 34,64 x 46 + 34,64 x 53 + 34,64
c). 456 x 45 + 456 x 10 – 456 x 55
a). 125 x 12 + 12 x 874 + 12
=(125+874+1)x12
=1000x12
=12000
b). 34,64 x 46 + 34,64 x 53 + 34,64
=34,64x(46+53+1)
=34,64x100
=3464
c). 456 x 45 + 456 x 10 – 456 x 55
=456x(45+10-55)
=456x0
=0
a) 125 x12 +12 x 874 + 12 x 1
=12 x (125 + 874 + 1)
=12 x 1000
=12000
b)34,64 x 46 + 34,64 x 53 +34,64 x 1
=34,64 x (46 + 53 + 1)
=34,64 x 100
=3464
c) 456 x 45 +456 x 10 - 456 x 55
=456 x (45 +10 - 55)
=456 x 0
= 0
Tính nhanh :
2, 5 * 8, 7 + 7, 5 * 8, 7 = ?
86 * 5 + 86 * 4 + 86 = ?
123,45 + 23,56 + 76,44 + 54,55 = ?
456 x 45 + 456 x 10 – 456 x 55 = ?
25 x 8 x 17 x 50 = ?
(12 x 2 + 12 x 4 – 12 x 6) : (2 + 4 +…….+12 + 14) = ?
(1+3+5+7+9+11+13+15) : (32 x 2) = ?
(24 x 6 + 4 x 24) : (49 – 24 x 2) = ?
(1+2+3+…..+98+99+100) : 5050 = ?
35 x 11 x 0,1 x 0,25 x 100 x (3 : 0,4 – 7,5) = ?
ai giải nhanh và đúng nhất m k cho, trình bày ra nhé
123,45 + 23,56 +76,44 + 54,55
= (123,45 + 54,55) + (23,56 + 76,44)
= 178 + 100
= 278
456 x 45 + 456 x 10 + - 456 x 55
=456 x (45 +10-55)
=456 x 0
=0
2,5 x 8,5 + 7,5 x 8,5
=8,5 x (2,5 +7,5)
= 8,5 x 10
= 85
86 x 5 + 86 x 4 + 86
= 86 x (5+4+1)
= 86 x10
860
25 x 8 x 17 x 50
= 50 x 4 x 17 x 50
= 200 x 17 x 50
= 200 x 50 x 17
= 10000 x 17
= 170000
(12 x 2 + 12 x 4 - 12 x 6 ) : ( 2 + 4 + 6 +... + 12 +14)
=(12 x (2 + 4 - 6) ) : ( 2 + 4 + 6 + ... + 12 + 14 )
= (12 x 0 ) : (2 + 4 + 6 + ... + 12 + 14 )
=0 : ( 2 + 4 + 6 + ... + 12 + 14)
= 0
So sánh:
a. 123/456 và 456/789
b A = 135 / 135 . 136 -1 và B = 136 / 136 . 137 -1
C = 3 / 10 + 3 / 11 + 3 / 12 + 3/ 13 + 3 / 14 và N = 2
làm nhanh nà
2. Tinh nhanh
a) 342 : 2+ 436 : 2 + 222 : 2
b) 875 : 5 –125 : 5 –250 : 5.....................................................................................................
c) 3456 : 3-456 : 3 –99 : 3...........................................
d) 2980 : 10 + 3570 : 10 –1580 : 10-1970 : 10......................................................................
...............................................................................................................
ai giúp mình đầu tiên thì mình tick nha
bai1:tim x biet a,(x:23+45)•67
bai2:tinh nhanh a,(44•52•60):(11•13•15) b,123•456-456•123123
\(\left(x:23+45\right).67=8911\)
\(x:23+45=8911:67\)
\(x:23+45=133\)
\(x :23=133-45\)
\(x:23=88\)
\(x=88.23\)
\(x=2024\)
Bài 2:
a, \(\frac{44.52.60}{11.13.15}=\frac{4.11.4.13.4.15}{11.13.15}=4.4.4=64\)
b, \(123.456-456.123123=456\left(123-123123\right)=456.\left(-123000\right)=-56088000\)
Tính nhanh:
a). 125 x 12 + 12 x 874 + 12
b). 34,64 x 46 + 34,64 x 53 + 34,64
c). 456 x 45 + 456 x 10 – 456 x 55
d).1475+399-475-199
a). 125 x 12 + 12 x 874 + 12
= 12 x (125 + 874 + 1)
= 12 x 1000
=12 000
mink chỉ bít câu a) thôi nha
12 x ( 125 + 874 ) = 12 x 999
= 11988
a ) 125 x 12 + 12 x 874 + 12
= 12 x ( 125 + 874 + 1 )
= 12 x 1000
= 12000.
b) 34,64 x 46 + 34,64 x 53 + 34,64
=34,64 x ( 46 + 53 + 1 )
= 34,64 x 100
= 3464.
c) 456 x 45 + 456 x 10 - 456 x 55
= 456 x ( 45 + 10 - 55 )
= 456 x 0
= 0
d) 1475 + 399 - 475 - 199
= ( 1475 - 475 ) + ( 399 - 199 )
= 1000 + 200
= 1200.
Bài 1 : Tính nhanh
a, 248 + ( -12 ) + 2064 + ( -236 )
b, ( -298 ) + ( -300 ) + ( -302 )
c, 5 + ( -7 ) + 9 + ( -11 ) + 13 + ( -15 )
d, ( -6 ) + 8 + ( -10 ) + 12 + ( -14 ) + 16
e, 456 + [58 + ( - 456 ) + ( -38 ) ]
Bài 2 : Bỏ dấu ngoặc rồi tính
a, 8 - ( 3 + 7 )
b, ( -5 ) - ( 9 - 12 )
c, ( 5674 - 97 ) + ( 97 + 18 - 5674 )
d, ( 13 - 135 + 49 ) - ( 13 + 49 )
e, x + 8 - ( x + 22 )
f, - ( x + 5 ) + ( x + 10 ) - 5
Bài 1:
a) 248 + (-12) + 2064 + (-236)
= 248 - 236 + 2064 - 12
= 12 + 2052
= 2064
b) (-298) + (-300) + (-302)
= -298 - 302 - 300
= -600 - 300
= -900
c) 5 + (-7) + 9 + (-11) + 13 + (-15)
= -2 - 2 - 2
= -6
d) (-6) + 8 + (-10) + 12 + (-14) + 16
= 2 + 2 + 2
= 6
e) 456 + [58 + (-456) + (-38)]
= 456 - 456 + 58 - 38
= 0 + 20
= 20
Bài 2:
a) 8 - (3 + 7)
= 8 - 3 - 7
= -2
b) (-5) - (9 - 12)
= -5 - 9 + 12
= -2
c) (5674 - 97) + (97 + 18 - 5674)
= 5674 - 97 + 97 + 18 - 5674
= 18
d) (13 - 135 + 49) - (13 + 49)
= 13 - 13 - 135 + 49 - 49
= -135
e) x + 8 - (x + 22)
= x + 8 - x - 22
= -14
f) - (x + 5) + (x + 10) - 5
= -x - 5 + x + 10 - 5
= 0