Tìm X :
A.) X - 123 = 123 x 8
B.) X + 123 : 2 = 111 x 9
12 ? 3 = 4 x 4 = ?
20 x 3 = ?
90 x 1 = ?
123 - 123 = ?
10 x 9 = ? / 9 = ?
12 - 9 = ? x 9 = ?
23 - 5 = ?
123 + 12 = ?
1000 - 200 = ?
333 - 111 = ?
12 : 3 = 4 x 4 = 16
20 x 3 = 60
90 : 1 = 90
123 - 123 = 0
10 x 9 = 90 : 9 = 10
12 - 9 = 3 x 9 = 27
23 - 5 = 18
123 + 12 = 135
1000 - 200 = 800
333 - 111 = 222
\(20.3=60\)
\(90.1=90\)
\(123-123=0\)
\(10.9=\frac{810}{9}=90\)
\(23-5=15\)
\(123+12=135\)
\(1000-200=800\)
\(333-111=222\)
Tìm x
X + 123 x 123 x 123 : 123=15129
x = [{(15129 x 123 ) : 123 } :123] : 123
x = 1
Tính nhanh
123 x 4 + 123 x 6 + 123 x 9 + 123
123 x 4 + 123 x 6 + 123 x 9 + 123
= 123 x 4 + 123 x 6 + 123 x 9 + 123 x 1
= 123 x (4 + 6 + 9 + 1)
= 123 x 20
= 2460
Đáp số : 2460
123 x 4 + 123 x 6 + 123 x 9 +123
= 123 x 4 + 123 x 6 + 123 x 9 +123 x 1
= 123 x (4 + 6 + 9 + 1)
= 123 x 20
= 2460
123x4 +123x6 +123x9 +123
=123 x4 +123x6+ 123x9 +123 x1
=123x (4+6+9+1)
=123x 20
=2460
0 x 9 + 1 = 1
1 x 9 + 2 = 11
12 x 9 + 3 = 111
123 x 9 + 4 = 1111
a x 9 + b = 11111
Tìm a,b
Tìm x
x + 123 = 123 - 123 + 123
x + 123 = 123 - 123 + 123
x + 123 = 123
x = 123 - 123
x = 0
x + 123 = 123 - 123 + 123
x + 123 =0 + 123
x + 123 =123
x = 123 - 123
x = 0
K MIK NHÉ!
x + 123 = 123 - 123 + 123
x = 123 - 123 + 123 - 123
x = 0
Tính bằng cách hợp lí:
a) 995 x 86 + 995 x 9 + 5 x 995
b) 158 x 123 - 123 x 155 – 123 x 3
A) 995× (86+9+5)
=995×100
=99500
B)123×(158-155-3)
=123×0=0
a)TÍNH BẰNG CÁCH THUẬN TIỆN
123 x 54 + 27 x 123 - 12 x 123 + 123 x 31
b)TÌM n
121/27 x 54/11 < n < 100/21 : 25/126
\(a,123\times54+27\times123-12\times123+123\times31\)
\(=123\times\left(54+27-12+31\right)\)
\(=123\times100\)
\(=12300\)
\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)
\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)
\(22< n< 24\)
Vì \(23>22\) và \(23< 24\) nên \(n=23\)
a)TÍNH BẰNG CÁCH THUẬN TIỆN
123 x 54 + 27 x 123 - 12 x 123 + 123 x 31
b)TÌM n
121/27 x 54/11 < n < 100/21 : 25/126
a123x54+27x123-12x123+123x31
=123:54+27:123-12:123+123:31
=6642+27:123-12:123+123:31
=6642+3321-12:123+123:31
=6642+3321-1476+123:31
=6642+3321-1476+3813
=12300
b,121/27x54/11<n>100/21:25/126
=22<n>24
n=23
Tính nhanh :
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10
123 x 45 + 123 x 50 + 123 x 5
Tính nhanh:
1+2+3+4+5+6+7+8+9+10
=(1+9)+(2+8)+(3+7)+(4+6)+10+5
= 10 + 10 + 10 + 10 + 10+5
= 50 + 5
= 55
123*45+123*50+123*5
= 123*(45+50+5)
= 123 * 100
= 12300
K mk nha bn
1+2+3+4+5+6+7+8+9+10
= ( 1+10 ) + ( 2+9) + (3+8) + (4+7) + (5+6)
= 11 + 11 + 11 + 11 + 11
=11 x 5
=55
123 x 45 + 123 x 50 + 123 x 5
= 123 x ( 45 + 50 +5 )
= 123 x 100
=12300
hok tốt .
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 10 : 2 x 11 = 55
123 x 45 + 123 x 50 + 123 x 5 = 123x ( 45 + 50 + 5) = 123 x 100 = 12300