Tìm x:
a) x + 27 = 45
b) x - 27 = 45
c) 45 - x = 27
d) 25 + x = 18 + 52
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a,
=85.35-85.27-35.85+35.27
=85.35+85.(-27)-35.85+35.27
=85[35+(-27)+(-35)]+35.27
=85.(-27)+35.27
=-85.27+35.27
=27.[(-85)+35]
=27.(-50)
=-1350
các câu còn lại cũng vậy
a, 85 x ( 35- 27 ) - 35 x ( 35 - 27 )
85 x 8 - 35 x 8
8 x ( 85 - 35 )
8 x 50 = 400
b, ( -45 ) x 69 + 30 x ( -45 ) +( -45)
( -45 ) x ( 69 + 30 + 1)
-45 x 100 = -4500
c , 26 + 7 x ( 4 - 12 )
26 + 7 x ( - 8 )
26 + ( -56 )=(- 30)
d , 127 - 18 x ( 5 + 6 )
127 - 18 x 11
127 - 180 + 18
-53 + 18 = - 35
= ( -25) x 1 +72 x (-25) + (-25) x27
= (- 25) x ( 1 + 72 + 27 )
= (-25) x 100
=-2500
b
c 37 x ( 25 + 37 ) - 27 x ( 37 + 25 )
= 37 x 25 + 37 x 37 -27x37 -27x25
= ( 37 x25 -27x25 )+(37x37-27+37)
=25 x ( 37 -27 ) + 37 x (37 - 27)
= 25 x10 + 37x10
= 250 + 370
= 770
a) =-25.( 1+72+27)
=-25.100= - 2500
b) = -36.45 + (-36) . 15 - (-36) . 40
= - 36. ( 45+15-40)
= -36 . 20= -720
c) =37.62 - 27 .62
= 62. ( 37 - 27 )
= 62 . 10
= 620
nhân hết ra là xong nha
a) 85x35-85x27-35x85+35x27=27x(35-85)=-1350
mấy cái kia cũng tương tự v
_Kudo_
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\Rightarrow x=30-9\)
\(\Rightarrow x=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14\)
\(\Rightarrow3+x=31\Rightarrow x=31-3\)
\(\Rightarrow x=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\Rightarrow2x=55+29\)
\(\Rightarrow2x=84\Rightarrow x=84:2\)
\(\Rightarrow x=42\)
\(d,\left(x-45\right).27=0\)
\(\Rightarrow x-45=0\Rightarrow x=45\)
Bài 6:
a)\(\left(-18\right)-\left(-3\right)-12\)
\(=\left(-18\right)+3-12\)
\(=-15-12\)
\(=-27\)
b)\(85.\left(35-27\right)-35.\left(85-27\right)\)
\(=85.35-85.27-35.85+35.27\)
\(=85.\left(35-27-35\right)+35.27\)
\(=85.\left(-27\right)+35.27\)
\(=27.\left(-85+35\right)\)
\(=27.\left(-50\right)\)
\(=-1350\)
c)\(\left(-45\right).69+31.\left(-45\right)\)
\(=\left(-45\right).\left(69+31\right)\)
\(=\left(-45\right).100\)
\(=-4500\)
Bài 7:
a)\(\left(2-x\right)+10=-14\)
\(\Rightarrow2-x=-24\)
\(\Rightarrow x=26\)
b)\(14.\left|x\right|=28\)
\(\Rightarrow\left|x\right|=2\)
\(\Rightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)
c)\(31-\left(17+x\right)=55\)
\(\Rightarrow17+x=-24\)
\(\Rightarrow x=-41\)
25 x 27 + 45 x 27 + 27 x 30
= 27 x ( 25 + 45 + 30 )
= 27 x ( 70 + 30 )
= 27 x 100
= 2700
k cho mk nha !
a) (x – 45).27 = 0 ó x – 45 = 0 ó x = 45
b) 41.(2x – 8).13 = 0 ó 2x – 8 = 0 ó x = 4
c) (x – 36):18 = 12 ó x – 36 = 12.18 ó x = 216 + 36 ó x = 252
d) 43.(x – 18) = 86 ó x – 18 = 86:43 ó x = 2+18 ó x = 20
e) 96 : (121 – x) = 4 ó 121 – x = 96 : 4 ó 121 – x = 24 ó x = 121 – 24 ó x = 97
f) 340 : (15x+5) = 17 ó 15x + 15 = 340 :17 ó 15x + 5 = 20 ó 15x = 20 – 5 ó 15x = 15 ó x = 1
Bài làm:
a) x + 27 = 45
x = 45 - 27
x = 18
Vậy x = 18
b) x - 27 = 45
x = 45 + 27
x = 72
Vậy x = 72
c) 45 - x = 27
x = 45 - 27
x = 18
Vậy x = 18
d) 25 + x = 18 + 52
25 + x = 70
x = 70 - 25
x = 45
Vậy x = 45