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TG
2 tháng 8 2020
1) \(373737.73-37.737373\)
\(=37.10101.73-37.73.10101\)
\(=0\)
2) \(19.41414141-41.19191919\)
\(=19.41.1010101-41.19.1010101\)
\(=0\)
3) \(123456.456789456789-456789.123456123456\)
\(=123456.456789.1000001-456789.123456.1000001\)
\(=0\)
4) \(250.12.7\)
\(=250.4.3.7\)
\(=\left(250.4\right).\left(3.7\right)\)
\(=1000.21\)
\(=21000\)
5) \(24.125.9\)
\(=3.8.125.9\)
\(=\left(3.9\right).\left(8.125\right)\)
\(=27.1000\)
\(=27000\)
6) \(125.44.18\)
\(=125.4.11.2.9\)
\(=\left(125.4.2\right).\left(11.9\right)\)
\(=1000.99\)
\(=99000\)
7) \(8.24.6+12.4.52+2.22.24\)
\(=48.24+48.52+48.22\)
\(=48\left(24+52+22\right)\)
\(=48.98\)
\(=48\left(100-2\right)\)
\(=48.100-48.2\)
\(=4800-96\)
\(=4704\)
8) \(18.58.2-9.27.4+12.69.3\)
\(=36.58-36.27+36.69\)
\(=36\left(58-27+69\right)\)
\(=36.100=3600\)
9) \(30.85.3+18.72.5-45.37.2-9.20.10\)
\(=90.85+90.72-90.37-90.20\)
\(=90\left(85+72-37-20\right)\)
\(=90.100=9000\)
15 tháng 1 2018
a, | x - 7 | = | -12 |
TH1: x - 7 =12
=> x = 12 + 7 =19
TH2: x - 7 = -12
=> x = -12 + 7 = -5
Vậy x = 19 hoặc x = -5
b, | 2x - 1 | = -(-9)
=> | 2x - 1 | = 9
TH1: 2x - 1 = 9
=> 2x = 9 + 1 = 10
=> x = 10 : 2 =5
TH2: 2x - 1= - 9
=> 2x = - 9 + 1 = -8
=> x = - 8 : 2 = - 4
Vậy x = 5 hoặc x = -4
c, x- (19-x)=x - 17
=> x - 19 + x = x - 17
=> x + x - x = -17 + 19 [[ khi chuyển vế sẽ như này nhé ! ]]
=> x = 2
Còn câu d để từ từ ........................ :)))))))
Y
9 tháng 3 2023
\(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}=\dfrac{14}{32}-\dfrac{4}{32}+\dfrac{9}{32}=\dfrac{19}{32}\)
\(\dfrac{5}{4}-\dfrac{25}{30}\times\dfrac{37}{44}+\dfrac{-25}{30}\times\dfrac{13}{44}+\dfrac{-25}{30}\times\dfrac{-6}{44}\)
\(=-\dfrac{25}{30}\times\left(\dfrac{5}{4}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\left(\dfrac{55}{44}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\dfrac{99}{44}\)
\(=-\dfrac{5}{6}\times\dfrac{9}{4}\)
\(=-\dfrac{15}{8}\)
H9
HT.Phong (9A5)
CTVHS
9 tháng 3 2023
\(\left(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\left(\dfrac{14}{32}+\dfrac{-4}{32}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\dfrac{19}{32}:\dfrac{5}{4}\)
\(=\dfrac{19}{32}.\dfrac{4}{5}=\dfrac{19.4}{32.5}=\dfrac{19}{40}\)
\(\dfrac{-25}{30}.\dfrac{37}{44}+\dfrac{-25}{30}.\dfrac{13}{44}+\dfrac{-25}{30}.\dfrac{-6}{44}\)
\(=\dfrac{-25}{30}.\left(\dfrac{37}{44}+\dfrac{13}{44}+\dfrac{-6}{44}\right)\)
\(=\dfrac{-25}{30}.\dfrac{44}{44}=\dfrac{-5}{6}.1=-\dfrac{5}{6}\)
8 tháng 2 2017
a) x - (17 - 8) = 5 + (10 - 3x)
x - 17 + 8 = 5 + 10 - 3x
x + 3x = 5 + 10 + 17 - 8
4x = 24
x = 24 : 4
x = 6
b) 25 - (30 + x) = x - (27 - 8)
25 - 30 - x = x - 27 + 8
-x - x = -27 + 8 - 25 + 30
-2x = -14
x = (-14) : (-2)
x = 7
c) (x - 12) - 15 = (20 - 7) - (18 + x)
x - 12 - 15 = 20 - 7 -18 - x
x + x = 20 - 7 - 18 + 12 + 15
2x = 22
x = 22 : 2
x = 11
d) 9 - 25 = (7 - x) - (25 + 7)
9 - 25 = 7 - x - 25 - 7
x = 7 - 25 - 7 - 9 +25
x = -9
5 tháng 10 2021
a) \(X+3=12\Leftrightarrow X=12-3\Leftrightarrow X=9\)
b) \(N+10=5\Leftrightarrow N=5-10\Leftrightarrow N=-5\)
c)\(N+12=3\Leftrightarrow N=3-12\Leftrightarrow N=-9\)
d)\(X+9=-8\Leftrightarrow X=-8-9\Leftrightarrow X=-17\)
e)\(N+\left(-5\right)=-12\Leftrightarrow N-5=-12\Leftrightarrow N=-12+5\Leftrightarrow N=-7\)
f)\(T+20=30\Leftrightarrow T=30-20\Leftrightarrow T=10\)
g)\(Q+3=0\Leftrightarrow Q=0-3\Leftrightarrow Q=-3\)
h)\(N+6=-12\Leftrightarrow N=-12-6\Leftrightarrow N=-18\)
i)\(Y+\left(-2\right)=-10\Leftrightarrow Y-2=-10\Leftrightarrow Y=-10+2\Leftrightarrow Y=-8\)
j)\(T+\left(-7\right)=0\Leftrightarrow T-7=0\Leftrightarrow T=0+7\Leftrightarrow T=7\)
NT
1
10 tháng 4 2020
a) ( -12 ) + ( - 9 ) + 121 + | -20 |
= ( - 21 ) + 121 + 20
= [ ( - 21) + 121 ] + 20
= 100 + 20
= 120
b) 49.125 - 49 .25
= 49 .( 125 -25 )
= 49. 100
= 4900
c) 20 -[ 30 - ( 5- 1)2 ]
= 20 - ( 30 - 42 )
= 20 - ( 30 - 16 )
= 20 - 14
= 6
d) 28 . 76 + 44.28 -28.20
= 28 .( 76 + 44 -20)
= 28 . 100
= 2800
10 tháng 7 2023
1: =-2/9(15/17+2/17)=-2/9
2: \(=\dfrac{-6}{3}+\dfrac{-21}{90}\)
=-2-7/30=-67/30
3: \(=\dfrac{3}{4}\cdot\dfrac{7}{5}+\dfrac{9}{7}\cdot\dfrac{3}{2}\)
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
10 tháng 7 2023
1: =-2/9(15/17+2/17)=-2/9
2: =−63+−2190=−63+−2190
=-2-7/30=-67/30
3: =34⋅75+97⋅32=34⋅75+97⋅32
=21/20+27/14=417/140
4: =-25/13(5/19+14/19)=-25/13
5: =-7/5-45/21=-7/5-15/7=-124/35
LN
2
15 tháng 7 2019
\(2,\frac{9}{x}=\frac{2}{5}-\frac{7}{20}\)
\(\Rightarrow\frac{9}{x}=\frac{1}{20}\)
\(\Rightarrow x=9.20\)
\(\Rightarrow x=180\)
15 tháng 7 2019
\(\frac{x}{5}=\frac{5}{6}+\left(-\frac{19}{30}\right)\)
\(\frac{\Rightarrow x}{5}=\frac{1}{5}\)
\(\Rightarrow x=1\)