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a)x*5,2:4,5=10,4
x*5,2=10,4*4,5
x*5,2=46,8
x =46,8:5,2
x =9
b)5/7*x+2/7*x=2/3
x*(5/7+2/7)=2/3
x*1 =2/3
x =2/3:1
x =2/3
a.
\(x\times5,2\div4,5=10,4\)
\(x\times5,2=10,4\times4,5\)
\(x\times5,2=46,8\)
\(x=46,8\div5,2\)
\(x=9\)
b.
\(\dfrac{5}{7}\times x+\dfrac{2}{7}\times x=\dfrac{2}{3}\)
\(x\times\left(\dfrac{5}{7}+\dfrac{2}{7}\right)=\dfrac{2}{3}\)
\(x\times1=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}\div1\)
\(x=\dfrac{2}{3}\)
a) x * 5.2 : 4.5 = 10.4
x = 10.4 * 4.5 : 5.2
x = 9
b) 17.4 : x * 5.3 = 36.888
17.4 : x = 36.888 : 5.3
17.4 : x = 6.96
x = 17.4 : 6.96
x = 2.5
a) X x 5,2 :4,5 = 10,4 b)17,4 : X x 5,3 = 36,888
X x 26/5 : 9/2 =52/5 87/5 : X x 53/10 = 4611/125
X x 52/45 =52/5 87/5 : X = 4611/125 : 53/10
X = 52/5 : 53/45 87/5 : X =174/25
X =9 X = 87/5 : 174 /125
vậy X=9 X =25/2
vậy X= 25/2
CHÚC BẠN HOK TỐT
X x5.2:4.5=10.4
X x5.2=10.4x4.5
X x5.2=46.8
X=46.8:5.2
X=9
Vậy X=9
1. a
\(\dfrac{8}{5}-\dfrac{5}{6}\cdot\dfrac{3}{4}\)
\(=\dfrac{8}{5}-\dfrac{5\cdot3}{3\cdot2\cdot4}\)
\(=\dfrac{8}{5}-\dfrac{5}{8}=\dfrac{39}{40}\)
1.b
\(=\dfrac{7}{8}+\dfrac{5}{6}\cdot\dfrac{3}{2}\)
\(=\dfrac{7}{8}+\dfrac{5\cdot3}{3\cdot2\cdot2}\)
\(=\dfrac{7}{8}+\dfrac{5}{4}=\dfrac{17}{8}\)
2.a
\(\dfrac{4}{5}+x=\dfrac{11}{10}\)
\(x=\dfrac{11}{10}-\dfrac{4}{5}=\dfrac{3}{10}\)
2.b
\(x-\dfrac{3}{4}=\dfrac{5}{7}\)
\(x=\dfrac{5}{7}+\dfrac{3}{4}=\dfrac{41}{28}\)
a) 105,6 - x = 29,04
x = 105,6 - 29,04
x = 76,56
b) x : 7 = 4,5 × 3
x : 7 = 13,5
x = 13,5 × 7
x = 94,5
c) Sửa đề: x × 2,8 + x × 5,2 = 48
x × (2,8 + 5,2) = 48
x × 8 = 48
x = 48 : 8
x = 6
d) Sửa đề:
x × 12,25 + x × 2,75 = 1050
x × (12,25 + 2,75) = 1050
x × 15 = 1050
x = 1050 : 15
x = 70
a) \(105,6-x=29,04\)
\(x=105,6-29,04\)
\(x=76,2\)
b) \(x:7=4,5x3\)
\(x:7=13,5\)
\(x=13,5x7\)
\(x=94,5\)
c) Bạn xem lại đề
d) Bạn xem lại đề
\(\left(x+9\right)+\left(x-8\right)+\left(x+7\right)+\left(x-6\right)+\left(x+5\right)+\left(x-4\right)+\left(x+3\right)+\left(x-2\right)+\left(x+1\right)=95.9\\ =>x+9+x-8+x+7+x-6+x+5+x-4+x+3+x-2+x+1=855\\ =>\left(x+x+x+x+x+x+x+x+x\right)+\left(9-8+7-6+5-4+3-2+1\right)=855\\ =>9x+5=855\\ =>9x=855-5\\ =>9x=850\\ =>x=\dfrac{850}{9}\)
\(\left(x+9\right)+\left(x-8\right)+...+\left(x-2\right)+\left(x+1\right)\)
\(=x+9+x-8+...+x-2+x+1\)
\(=\left(x+9+x-8\right)+...+\left(x+5\right)+...+\left(x-2+x+1\right)\)
(Ta gộp 4 số vào 1 tổng, riêng (x+5) là ta giữ nguyên)
\(=\left(2x-1\right)+...+\left(x+5\right)+...+\left(2x-1\right)\)
\(=4\left(2x-1\right)+\left(x+5\right)\)
\(=8x-4+x-5\)
\(=9x-9\) (1)
Từ bài toán trên, ta có:
\(\left(x+9\right)+\left(x-8\right)+...+\left(x-2\right)+\left(x+1\right)=95,9\)
Từ (1)
\(\Leftrightarrow9x-9=95,9\)
\(9x=95,9-9\)
\(x=86,9:9\)
\(x=9,6\left(5\right)\)
a) X*5,2 : 4,5 =10,4
X*5,2=10,4*4,5
X*5,2=46,8
X =46,8:5,2
X =9
b) 5/7*x+2/7*x=2/3
(5/7+2/7)*x=2/3
1*x =2/3
x =2/3:1
x =2/3