tính nhanh 129 x 5 + 3 x 129 + 2 x 129
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5 - ( 12 - x ) = 129 - ( 6 + 129 )
5 - 12 + x = 129 - 6 - 129
( -7 ) + x = ( -6)
x = ( - 6 ) + 7
x = 1
Vậy x = 1
5-(12-x)=129-(6+129)
5-(12-x)=129-135
5-(12-x)=-6
12-x =5-(-6)
12-x=11
x=12-11
x=1
746x79+746+746x20=746x(79+1+20)
=746x100
=74600
129x78-78-28=78x(129-28)
=78x101
=7878
7x25x5x4=(25x4)x(7x5)
=100x35
=3500
tick mình nha!
se bang:
=123+124+125+126+127+128+129+6500
=(123+127)+(124+126)+(125+128)+(129+5600)
=250+250+253+5729
=(250+250)+(253+5729)
=500+5982
=6482
\(x=96-12=84.\)
\(x=96-12=84\)
\(x=98-78=20\)
\(x=69-27=42\)
\(x=85-20=65\)
\(x=129-85=44\)
\(x=201-129=72\)
\(x=98+129=227\)
96 - x = 12
x = 96 - 12
x = 84
78 + x = 98
x = 98 - 78
x = 20
x + 27 = 69
x = 69 - 27
x = 42
x + 20 = 85
x = 85 - 20
x = 65
x + 85 = 129
x = 129 - 85
x = 44
x + 129 = 201
x = 201 - 129
x = 72
x - 129 = 98
x = 129 - 98
x = 31
k mình nha , Thank you !
\((x-5)^3+4=129\\\Rightarrow (x-5)^3=129-4\\\Rightarrow (x-5)^3=125\\\Rightarrow (x-5)^3=5^3\\\Rightarrow x-5=5\\\Rightarrow x=5+5\\\Rightarrow x=10\\Vậy:x=10\)
`136 -4^2 : x=134`
`=> 136-16:x=134`
`=> 16:x= 136-134`
`=> 16:x=2`
`=>x=16:2`
`=>x=8`
__
`19-5(x-1)=4`
`=> 5(x-1)=19-4`
`=> 5(x-1) =15`
`=> x-1=15:5`
`=>x-1=3`
`=>x=3+1`
`=>x=4`
__
`257-(x^2-1) =177`
`=>x^2-1=257-177`
`=>x^2-1=80`
`=>x^2=80+1`
`=>x^2=81`
`=>x^2=(+- 9)^2`
`=> x= +- 9`
__
`(x^2-17) : 8=2^3`
`=> x^2 -17 = 8 * 8`
`=> x^2 -17= 64`
`=> x^2 =64+17`
`=>x^2=81`
`=>x^2=(+- 9)^2`
`=> x= +- 9`
136 - 4² : x = 134
4² : x = 136 - 134
8 : x = 2
x = 8 : 2
x = 4
--------
129 - 5(x - 1) = 4
5(x - 1) = 129 - 4
5(x - 1) = 125
x - 1 = 125 : 5
x - 1 = 25
x = 25 + 1
x = 26
------------
257 - (x² - 1) = 177
x² - 1 = 257 - 177
x² - 1 = 80
x² = 80 + 1
x² = 81
x = -9 hoặc x = 9
--------
(x² - 17) : 8 = 8
x² - 17 = 8 . 8
x² - 17 = 64
x² = 64 + 17
x² = 81
x = -9 hoặc x = 9
\(\left(158x129-158x39\right):18\)
\(=\left[158\left(129-39\right)\right]:18\)
\(=158.90:18\)
\(=14220:18\)
\(=790\)
129x5+3x129+2x129
=129x(5+3+2)
=129x10=1290
=129 x (5 + 3 + 2)
=129 x 10
=1290