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25 + ( 15 + x) = 125
15 + x = 125 - 25
15 + x = 100
x = 100 - 15
x = 85
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
Bạn giải theo công thức sau
Đầu tiên tìm số các số hạng
(SL-SB):KC+1
Tìm tổng
(SL+SB)XSCSH:2
35.(24−6.x)=0
24-6x= 0:35
24-6x=0
6x=24-0
6x=24
x=24:6=4
3.(x+7)−15=27
3(x+7)=27+15
3(x+7)=42
x+7=42:3
x+7=14
x=14-7=7
TK MIK NHA~~
y x 6 + y x 3 + y = 80
y x 6 + y x 3 + y x 1 = 80
y x (6+3+1)=80
y x 10 =80
y =80:10
y =8
a) \(y\times6+y\times3+y=80\)
\(\Leftrightarrow y\times\left(6+3+1\right)=80\)
\(\Leftrightarrow y\times10=80\)
\(\Leftrightarrow y=80\div10\)
\(\Leftrightarrow y=8\)
b) \(y+y\div0,5+y\div0,25+y\div0,125=15\)
\(\Leftrightarrow y+y\times2+y\times4+y\times8=15\)
\(\Leftrightarrow y\times\left(1+2+4+8\right)=15\)
\(\Leftrightarrow y\times15=15\)
\(\Leftrightarrow y=1\)
X – 60 : 15 = 20,5
=> X – 60 = 307,5
=> X = 367,5
X : 4 + 12 = 23
=> X : 4 = 11
=> X = 44
( x – 60 ) : 15 = 20
=> x – 60 = 300
=> x = 360
3 .(x + 7)- 15= 27
=> 3 .(x + 7) = 42
=> x + 7 = 14
=> x = 7
2. ( x – 5 )- 17 = 24 + 6 x 1,5
=> 2. ( x – 5 ) - 17 = 33
=> 2. ( x – 5 ) = 50
=> x - 5 = 25
=> x = 30
\(a,x-60:15=20,5\)
\(x-4=20,5\)
\(x=20,5+4=24,5\)
\(b,x:4+12=23\)
\(x:4=23-12=11\)
\(x=11.4=44\)
\(c,\)\(\left(x-60\right)\)\(:15=20\)
\(x-60=20.15=300\)
\(x=300+60=360\)
\(d,3\left(x+7\right)\)\(-15=27\)
\(3\left(x+7\right)\)\(=27+15=42\)
\(x+7=42:3=14\)
\(x=14-7=7\)
\(e,2\left(x-5\right)\)\(-17=24+6.1,5=24+9=33\)
\(2\left(x-5\right)\)\(=33+17=50\)
\(x-5=50:2=25\)
\(x=25+5=30\)
=>........................