bài 4 tìm a thuộc N
a)697:\(\dfrac{15a+364}{a}=17\)
b)92.4-27=\(\dfrac{a+350}{a}+315\)
Tìm a thuộc N biết
a) 697 : (15a+364/a) = 17
b) 92 . 4 - 27 = a+350/a + 315
\(a.697:\frac{15a+364}{a}=17\)
\(b.92.4-27=\frac{a+350}{a}+315\)
a.\(697:\frac{15a+364}{a}=17\)
b.\(92.4-27=\frac{a+350}{a}+315\)
Tìm số tự nhiên a:
a)697:15.a+364:a=17
b)92.4-27=a+350:a+315
697 : (15.a+364) \ a =17
92.4 -27 = (a+350) \ a+315
tịt???????????????????????????????????????___________________????????????????????????????????????????????????
\(\frac{15.a+364}{a}\)= 697:17=41
15+\(\frac{364}{a}\)=41
\(\frac{364}{a}\)=41-15=26
a=364:26
a=14
368-27=\(\frac{a+350}{a}\)+315
314=\(\frac{a+350}{a}\)+315
\(\frac{a+350}{a}\)=341-315
\(\frac{a+350}{a}\)=26
a+350=26.a
26.a-a=350
(26-1).a=350
25.a=350
a=350:25
a=14
Tìm A \(\in N\)
a) 697 : \(\frac{15.a+364}{a}=17\)
b) 92.4 - 27 = \(\frac{a+350}{a}+315\)
a.\(697:\frac{15.a+364}{a}=17\)
\(\Leftrightarrow\frac{15.a+364}{a}=41\)
\(\Leftrightarrow15.a+364=41.a\)
\(\Leftrightarrow15.a-41.a=-364\)
\(\Leftrightarrow a.\left(15-41\right)=-364\)
\(\Leftrightarrow a.\left(-26\right)=-364\)
\(\Leftrightarrow a=14\)
b.\(92.4-27=\frac{a+350}{a}+315\)
\(\Leftrightarrow368-27=\frac{a+350}{a}+315\)
\(\Leftrightarrow\frac{a+350}{a}+315=341\)
\(\Leftrightarrow\frac{a+350}{a}=26\)
\(\Leftrightarrow a+350=a.26\)
\(\Leftrightarrow350=a.26-a\)
\(\Leftrightarrow a.\left(26-1\right)=350\)
\(\Leftrightarrow a.25=350\)
\(\Leftrightarrow a=14\)
tìm số tự nhiên x biết:
a) 697 : \(\dfrac{15:x+364}{x}\) = 17
b) 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315
c) 720 : [41 - ( 2x - 5 )] = 23 . 5
mọi ngườ giúp em câu này với ạ .
b, 92 : 4 - 27 = \(\dfrac{x+350}{x}\) + 315
23 - 27 = 1 + \(\dfrac{350}{x}\) + 315
316 + \(\dfrac{350}{x}\) = -4
\(\dfrac{350}{x}\) = - 316 - 4
\(\dfrac{350}{x}\) = -320
-320 \(x\) = 350
\(x\) = 350: (-320)
\(x\) = - \(\dfrac{35}{32}\) (loại)
Vậy \(x\) \(\in\) \(\varnothing\)
c, 720 : [ 41 - (2\(x\) - 5)] = 23.5
41 - (2\(x\) - 5) = 720 : (23.5)
41 - 2\(x\) + 5 = 18
46 - 2\(x\) =18
2\(x\) = 46 - 18
2\(x\) = 28
\(x\) = 28: 2
\(x\) = 14
Vậy \(x\) = 14
Tìm a \(\in\) N:
a) \(697:\frac{15a+364}{a}=17\)
b) \(92\cdot4-27=\frac{a+350}{a}+315\)
a) \(697:\frac{15a+364}{a}=17\)
\(\Rightarrow\frac{15a+364}{a}=697:17\)
\(\Rightarrow\frac{15a+364}{a}=41\)
\(\Rightarrow15a+364=41a\)
\(\Rightarrow364=26a\Rightarrow a=364:26\)
\(\Rightarrow a=14\)
b)
\(368-27=\frac{a+350}{a}+315\)
\(341=\frac{a+350}{a}+315\)
\(\left(a+350\right):a=341-315\)
\(\left(a+350\right):a=26\)
\(a+350=26a\)
\(\Rightarrow350=25a\)
\(\Rightarrow a=14\)
1. tìm số tự nhiên a ,biết rằng :
a, 697 : 15.a+364 phần a = 17
b, 92.4 -27=a+350 phần a +315
ai giải được mk sẽ tick cho nha!
15.A+364A=697:1715.A+364A=697:17
15.A+364A=4115.A+364A=41
15+364A=4115+364A=41
364A=41−15364A=41−15
364A=26364A=26
A=364:26A=364:26
A=14A=14