-9+111:x=-12-34
-9 + 111 : x = -12 - 34
Vậy x=?
-9 + 111 :x = -12 - 34
-9 + 111 : x = -46
111 : x = ( -46 ) - ( -9 )
111 : x = -37
x = 111 : ( -37)
x = -3
-9 + 111 : x = -12 - 34
-9 + 111 : x = -46
111 : x = (-46) - (-9)
111 : x = -37
x = 111 : ( -37 )
x = -3
Tìm a, biết :
a) a = 100!
b) a = 1 ^ 2 + 2 ^ 2 + 3 ^ 2 + ... + 100 ^ 2
c) a = 1 + 2 + 3 + 4 + ... + 1 tỷ
d) a = 111 111 111 : 9
e) a = ƯCLN(23 000; 34 000; 45 000; 50 000; 65 000; 76 000; 87 000)
g) a = BCNN(12; 23; 34; 45; 56; 67; 78; 89; 90)
Tìm x:
249 - (x + 34) = 111
\(249-\left(x+34\right)=111\)
\(x+34=249-111\)
\(x+34=238\)
\(x=238-49\)
\(x=189\)
294-(x+34)=111
x+34=294-111
x+34=183
x=183-34
x=149
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
\(20.3=60\)
\(90.1=90\)
\(123-123=0\)
\(10.9=\frac{810}{9}=90\)
\(23-5=15\)
\(123+12=135\)
\(1000-200=800\)
\(333-111=222\)
2 + 2+ 19 +x +5=30
x- 12 +x - 5 =30
(x+9)x (10-4 =24,12
(x+9 )x (333-111) =1998
2+2+19+x+5=30
=> 2+2+19+5+x=30
=> 28+x=30
=> x = 30-28
=> x = 2
Tính nhanh :
a) 19 x 64 + 76 x 34
b) 35 x 12 + 65 x 13
c) 136 x 68 + 16 x 272
d) ( 2 + 4 + 6 + ...... + 100 ) x ( 36 x 333 - 108 x 111 )
e ) 19991999 x 1998 - 19981998 x 1999
a. 19.64 + 76.34 = 19.64 + 19.4.34 = 19.64 + 19.136 = 19.(136 + 64) = 19.200 = 3800
b. 35.12 + 65.13 = 35.12 + 65.(12 + 1) = 35.12 + 35.12 + 65 = (35 + 65).12 + 65 = 1200 + 65 = 1265
c. 136.68 + 16.272 = 136.68 + 16.136.2 = 136.68 + 136.32 = 136.(68 + 32) = 136.100 = 13600
d. (2 + 4 + 6 + ... + 100) x (36 x 333 - 108 x 111) = (2 + 4 + 6 + ... + 100) x 0 = 0
e. 19991999 x 1998 - 19981998 x 1999 = 1999 x 10001 x 1998 - 1998 x 10001 x 1999 = 0
a) 19 .64 + 76.34
= 19.64 + 19.4.34
= 19(64 + 4.34)
= 19.200 = 3800
b) 35.12 + 65.13
= 35.12 + 65.12 + 65
= 12(35 + 65) + 65
= 12.100 + 65 = 1265
c) 136.68 + 16.272
= 136.68 + 16.2.136
= 136(68 + 16.2)
= 136.100= 13600
d) ( 2 + 4 + 6 + ...... + 100 ).( 36 x 333 - 108 x 111 )
= ( 2 + 4 + 6 + ...... + 100 ).(36.3.111 - 108.1110
= ( 2 + 4 + 6 + ...... + 100 ).(108.111 - 108.111)
= ( 2 + 4 + 6 + ...... + 100 ).0 = 0
e ) 19991999 x 1998 - 19981998 x 1999
= 1999.10001.1998 - 1998.10001.1999 = 0
các bank cho mk hỏi nhé số 16 từ đâu ra vậy ban hãy giai thick
Kết bạn với taeyeon nhé :
12 + 9 = ?
111 + 111 = ?
12+9=21
111+111=222
tk nha rùi ms kết bn
Tìm số nguyên x, biết
a) (-12).x = (-15).(-4) -12
b) (-9).x +3 = (-2).(-7) +16
c) (-12).x -34 = 2
a)
− 12 . x = − 15 . − 4 − 12 − 12 . x = 60 − 12 − 12 . x = 48 x = 48 : − 12 x = − 4
b)
− 9 . x + 3 = − 2 . − 7 + 16 − 9 . x + 3 = 14 + 16 − 9 . x + 3 = 30 − 9 . x = 30 − 3 − 9 . x = 27 x = 27 : − 9 x = − 3
c)
− 12 . x − 34 = 2 − 12 . x = 2 + 34 − 12 . x = 36 x = 36 : − 12 x = − 3
Tìm số nguyên x, biết
a) − 12 . x = − 15 . − 4 − 12
b) − 9 . x + 3 = − 2 . − 7 + 16
c) − 12 . x − 34 = 2
a)
− 12 . x = − 15 . − 4 − 12 − 12 . x = 60 − 12 − 12 . x = 48 x = 48 : − 12 x = − 4
b)
− 9 . x + 3 = − 2 . − 7 + 16 − 9 . x + 3 = 14 + 16 − 9 . x + 3 = 30 − 9 . x = 30 − 3 − 9 . x = 27 x = 27 : − 9 x = − 3
c)
− 12 . x − 34 = 2 − 12 . x = 2 + 34 − 12 . x = 36 x = 36 : − 12 x = − 3