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a) 115 + 5 ( x – 4 ) = 120
5 ( x – 4 ) = 120 – 115
5 ( x – 4 ) = 5
x – 4 = 5 : 5
x – 4 = 1
x = 1 + 4
x = 5
=115 . (-65-65) - 1200
=115 . (-130) - 1200
=-14950 - 1200
=-16150
Ta có:
\(115+5\left(x-4\right)=120\)
\(5\left(x-4\right)=120-115=5\)
\(\Rightarrow x-4=1\Rightarrow x=5\)
115+5(x-4)=120
5(x-4)=120-115
5(x-4)=5
x-4=5:5
x-4=1
x =1+4
x =5
a) 115 + 5 ( x – 4 ) = 120
5 ( x – 4 ) = 120 – 115
5 ( x – 4 ) = 5
x – 4 = 5 : 5
x – 4 = 1
x = 1 + 4
x = 5
b) 5|x| – 10 0 = 3 7 : 3 5
5| x | – 1 = 3 2
5| x | = 9 + 1
5| x | = 10
| x | = 2
x = 2 hoặc x = -2
c) 2 2016 . 2 x - 1 = 2 2015
2 x - 1 = 2 2015 : 2 2016
2 x - 1 = 2 2015 - 2016
2 x - 1 = 2 - 1
⇒ x – 1 = -1
x = -1 + 1
x = 0
\(32.65+35.152-35.120\)
\(=32.65+35(152-120)\)
\(=32.65+35.32\)
\(=32(65+35)\)
\(=32.100\)
\(=3200\)
P/s: Dấu chấm là dấu nhân. Hok tốt~
32 x 65 + 35 x 152 - 35 x 120
= 32 x 65 + 35 ( 152 - 120 )
= 32 x 65 + 35 x 32
= 32 x ( 65 + 35 )
= 32 x 100
= 3200
Đáp án cần chọn là: B
2 x − 3 4 − 4 15 − 1 4 = 1 20 − 1 15 2 x − 3 4 − 1 60 = − 1 60 2 x − 3 4 = 0 2 x − 3 4 = 0 2 x = 3 4 x = 3 8
Vậy có 1 giá trị của x thỏa mãn bài toán.
4. ( x - 250 ) : 6 = 64 - 12
( x- 250 ) : 6 = 52
x - 250 = 312
x = 562
5. 10x = 1030
=> x = 103
6. 30x = 120
x = 4
7. \(x=2023\)
\(8.165-\left(35:x+3\right).19=13\)
\(\left(35:x+3\right).19=152\)
\(35:x+3=8\)
\(35:x=5\)
\(x=7\)
4) \(\left(x-250\right)\div6=4^3-2^2\times3\)
\(\left(x-250\right)\div6=64-4\times3\)
\(\left(x-250\right)\div6=64-12=52\)
\(x-250=52\times6=312\)
\(x=312+250\)
\(x=562\)
5) \(2x+3x+5x=1030\)
\(x\left(2+3+5\right)=1030\)
\(10x=1030\)
\(x=1030\div10\)
\(x=103\)
6) \(15x-35x+50x=120\)
\(x\left(15-35+50\right)=120\)
\(30x=120\)
\(x=120\div30\)
\(x=4\)
7) \(\dfrac{1}{2}x+\dfrac{1}{6}x+\dfrac{1}{3}x=2023\)
\(x\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}\right)=2023\)
\(x\times1=2023\)
\(x=2023\)
8) \(165-\left(35\div x+3\right)\times19=13\)
\(\left(35\div x+3\right)\times19=165-13\)
\(\left(35\div x+3\right)\times19=152\)
\(35\div x+3=152\div19=8\)
\(35\div x=8-3=5\)
\(x=35\div5\)
\(x=7\)
(-233) + (-25 + 233) - (-100 + 75)
= -233 + (-25) + 233 + 100 - 75
= -233 -25 + 233 + 100 -75
=(-233+233)-25+100-75
=0-25+100-75
=0
(-233)+(-25+233)-(-100+75)
=(-233)+(-25)+233-(-100)-75
=(-233+233)+(-25-75)-(-100)
=(-100)-(-100)
=(-100)+100
=0
115-(374+115)+(-65+374)
=115-374-115+(-65)+374
=(115-115)+(-374+374)+(-65)
=0+0+(-65)
=(-65)
a)165-162:(65-62)
=165-162:3
=165-54
=111
b)(9-2)^3+2014^0.(2014!-2014!)^4
=7^3+2014^0.0^4
=343+2014^0.0
=343+2014^0
=343+1
=344
=>x+120=165-65-115
=>x+120=-115
hay x=-235