x.125-x.37=1196
tìm x
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\(x\times125-x\times25=37800\\ \Rightarrow x\times\left(125-25\right)=37800\\ \Rightarrow x\times100=37800\\ x=378\)
a. 96 - 3(x + 1) = 42
<=> 96 - 3x - 3 = 42
<=> 96 - 3 - 42 = 3x
<=> 3x = 51
<=> x = 17
b. (x - 37) : 12 = 9
<=> \(\dfrac{x}{12}-\dfrac{37}{12}=9\)
<=> \(\dfrac{x}{12}-\dfrac{37}{12}=\dfrac{108}{12}\)
<=> x - 37 = 108
<=> x = 108 + 37
<=> x = 145
c. 125 : (x - 3) = 5
<=> \(\dfrac{125}{x}-\dfrac{125}{3}=5\)
<=> \(\dfrac{375}{3x}-\dfrac{125x}{3x}=\dfrac{625x}{3x}\)
<=> 375 - 125x = 625x
<=> 375 = 625x + 125x
<=> 500x = 375
<=> x = \(\dfrac{375}{500}=\dfrac{3}{4}\)
Giải
Bài 1
\(1,a,-40-37-\left(-29\right)\\ =-40-37+29\\ =-77+29=-48\\ b,27+\left(-36\right)-\left(-45\right)=27-36+45\\ =-9+45\\ =36\\ c,-125-\left[\left(-18\right)-125\right]\\ =-125+18+125\\ =\left(-125+125\right)+18\\ =18\\ d,140+\left[\left(-184\right)-140\right]\\ =140-184-140\\ =\left(140-140\right)-184\\ =0-184\\ =-184\)
Bài 2
\(a,x-\left(-15\right)=-8\\ =>x+15=-8\\ =>x=-8-15\\ =>x=-23\\ b,-40-x=-35\\ =>x=\left(-40\right)-\left(-35\right)\\ =>x=-40+35\\ =>x=-5\\ c,x+\left(-50\right)=-27\\ =>x-50=-27\\ =>x=-27+50\\ =>x=23\)
1, Thực hiện phép tính:
\(a,-40+\left(-37\right)-\left(-29\right)=-77-\left(-29\right)=-48\)
\(b,27+\left(-36\right)-\left(-45\right)=-9-\left(-45\right)=36\)
\(c,-125-\left[\left(-18\right)-125\right]=-125-\left(-143\right)=18\)
\(d,140+\left[\left(-184\right)-140\right]=140+\left(-324\right)=-184\)
2, Tìm x biết:
\(a,x-\left(-15\right)=-8\)
\(x=-8+\left(-15\right)\)
\(x=-23\)
\(b,-40-x=-35\)
\(x=-40-\left(-35\right)\)
\(x=-5\)
\(c,x+\left(-50\right)=-27\)
\(x=-27-\left(-50\right)\)
\(x=23\)
a) 2 . ( 12 + x ) = 125 - 37
2 . ( 12 + x ) = 88
12 + x = 88 : 2
12 + x = 44
x = 44 - 12
x = 32
b) 87 - ( 321 - x ) : 5 = 3 . 52
87 - ( 321 - x ) : 5 = 75
87 - ( 321 - x ) = 75 . 5
87 - ( 321 - x ) = 375
321 - x = 87 - 375
321 - x = -288
x = 321 + ( - 288 )
x = 33
HỌC TỐT !
a) \(2.\left(12+x\right)=125-37\)
\(\Rightarrow2.\left(12+x\right)=88\)
\(\Rightarrow12+x=88:2\)
\(\Rightarrow12+x=44\)
\(\Rightarrow x=44-12\)
\(\Rightarrow x=32\)
Vậy \(x=32\)
b) \(87-\left(321-x\right):5=3.5^2\)
\(\Rightarrow87-\left(321-x\right):5=3.25\)
\(\Rightarrow87-\left(321-x\right):5=75\)
\(\Rightarrow87-\left(321-x\right)=75.5\)
\(\Rightarrow87-\left(321-x\right)=375\)
\(\Rightarrow321-x=87-375\)
\(\Rightarrow321-x=-288\)
\(\Rightarrow x=321-\left(-288\right)\)
\(\Rightarrow x=609\)
Vậy \(x=609\)
a,\(\frac{37.13-13}{24+37.12}=\frac{36.13}{39.12}=1\)
b,125.7.16.25.4=(125.16).(25.4).7=2000.100.7=1400000
c,8.9.14+6.17.12+19.4.18=2^3.3^2.2.7+2.3.17.2^2.3+19.2^2.3^2.2=2^3.3^2.(2.7+17+19)=72.50=3600
7 x 17 x 125 = (8 x 125) x 17 = 1000 x 17 = 17000
4 x 37 x 25 = (25 x 4 ) x 7 = 100 x 7 = 700
43 x 27 + 93 x 43 + 57 x 81 + 69 x 57 = 43 x (27 + 93) + 57 x (81 +69) = 43 x 120 + 57 x 120 + 57x30 = 120 x (43 + 57) + 1710 = 12000 + 1710 = 13710
Rin sẽ làm bài 2
a. 4 - 2x = -56
2x = 4 + 56
2x = 60
x = 30
b. -9x + 42 = 66
-9x = 24
x = 24 : -9
x = \(\frac{-24}{9}\)
c. 5 x 1x - 111 = 125
1x - 111 = 25
1x = 136
x = 136
d. (2x +1)2 = 81
(2x +1)2 = 92
=> 2x + 1 = 9
2x = 10
x = 5