10 x 23 + 20 x 23 + 70 x 23
Tìm x, biết:
a, 70 - 5 ( x - 3 ) = 45
b, 10 + 2 x = 4 5 : 4 3
c, 60 - 3 x - 2 = 51
d, 4 x - 20 = 2 5 : 2 3
a, 70 - 5 ( x - 3 ) = 45
⇔ 5 . x - 3 = 70 - 45
⇔ 5 x - 3 = 35
⇔ x - 3 = 35 : 5 ⇔ x - 3 = 7
⇔ x = 10
b, 10 + 2 x = 4 5 : 4 3
⇔ 10 + 2 x = 4 2 ⇔ 10 + 2 x = 16
⇔ 2 x = 4 ⇔ x = 2
c, 60 - 3 x - 2 = 51
⇔ 3 x - 2 = 60 - 51
⇔ 3 x - 2 = 9
⇔ x - 2 = 3 ⇔ x = 5
d, 4 x - 20 = 2 5 : 2 3
⇔ 4 x - 20 = 2 2 ⇔ 4 x - 20 = 4
⇔ 4 x = 24 ⇔ x = 6
23 x 14 + 23 x 16 + 20 x 23 + 50 x 23 = ?
Ai giúp mik vs mik tick cho
TL:
23 x 14 + 23 x 16 + 20 x 23 + 50 x 23
= 23 x ( 14 + 16 + 20 + 50 )
= 23 x 100
= 2300
- HT -
Ta có 23 x 14 + 23 x 16 + 20 x 23 + 50 x 23 = 23 x (14 + 16 + 20 + 50 ) = 23 x 100 = 2300
đáp án là 2300 nha
k cho mình nha
Bài 2: (2,5 điểm) Tìm x, biết:
a) 23 + 3x = 125 b) 70 – 5.(x - 3)= 45 c) 20 + 5x = 57:55
a)23+3 𝑥 =125 | b) 70 – 5.(𝑥 - 3)= 45 | c) 20 + 5 𝑥 = 57:55
3 𝑥 +23=125 | 70−5 𝑥 +15=45 | 5 𝑥 +20=5755
𝑥=34 | 𝑥=8 | 𝑥=−104
275
a: \(\Leftrightarrow3x=102\)
hay x=34
BÀI 5: Tim x biết:
a) 3636:(12x-91) =36
b) (x : 23+45).67=8911
c) 420+65.4 =(x+175):5+30
d) (32.15):2=(x+70):14-10
e)x-4867=(175.2-50.70):25+23
a) 3636:(12x-91) =36
12x-91 = 3636:36
12x-91=101
12x=101+91
12x=192
x=192:12
x=16
b) (x : 23+45).67=8911
(x : 23+45)=8911:67
(x : 23+45)=133
x:23=133-45
x:23=88
x=88.23
x=2024
c) 420+65.4 =(x+175):5+30
420+260=(x+175):5+30
680=(x+175):5+30
(x+175):5=680-30
(x+175):5=650
(x+175)=650x5
(x+175)=3250
x=3250-175
x=3075
d) (32.15):2=(x+70):14-10
480:2=(x+70):14-10
240=(x+70):14-10
(x+70):14=240+10
(x+70):14=250
(x+70)=250.14
(x+70)=3500
x=3500-70
x=3430
e)x-4867=(175.2-50.70):25+23
x-4867=(350-3500):25+23
x-4867=-3150:25+23
x-4867=-126+23
x-4867=-103
x=-103+4867
x=4764
BÀI 5: Tim x biết:
a) 3636:(12x-91) =36
b) (x : 23+45).67=8911
c) 420+65.4 =(x+175):5+30
d) (32.15):2=(x+70):14-10
e)x-4867=(175.2-50.70):25+23
(x-18)-42=(23-43)-(70+x)
Ta có: \(\left(x-18\right)-42=\left(23-43\right)-\left(70+x\right)\)
\(\Leftrightarrow x-18-42=23-43-70-x\)
\(\Leftrightarrow x-60=-90-x\)
\(\Leftrightarrow x+x=-90+60\)
\(\Leftrightarrow2x=-30\)
hay x=-15
Vậy: x=-15
\(\left(x-18\right)-42=\left(23-43\right)-\left(70+x\right)\)
\(\Leftrightarrow x-18-42=-20-70-x\)
\(\Leftrightarrow x-60=-90-x\)
\(\Leftrightarrow x+x=-90+60\)
\(\Leftrightarrow2x=-30\)
\(\Leftrightarrow x=-15\)
Ta có: (x−18)−42=(23−43)−(70+x)(x−18)−42=(23−43)−(70+x)
⇔x−18−42=23−43−70−x⇔x−18−42=23−43−70−x
⇔x−60=−90−x⇔x−60=−90−x
⇔x+x=−90+60⇔x+x=−90+60
⇔2x=−30⇔2x=−30
x=-15
Vậy: x=-15
10/23 x 5/8 + 5/8 x 14/23 - 1/23 x 5/8
X - 4867 = ( 175 x 2050 x 70 ) : 25 + 23
X - 4867 = 25112500 : 25 + 23
X - 4867 = 1004500 + 23
X - 4867 = 1004523
X = 1004523 + 4867
X = 1009390
Tìm x € Z
Câu 8:
5-|x-4|=-7+(23-54)-(-54+23)
Câu 9:
|x+7|=15+|-27|-(13-17+|-20|)
Câu 10:
|x-7|+24=24-x+(-24)+x+|-40|