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a: =>x=1135:37=1135/37
b: =>3x=165
hay x=55
c: =>x-8=92
hay x=100
\(a,x=1135:37=30\left(dư.27\right)\\ b,x\times3=40755:247=165\\ x=165:3=55\\ c,x-8=57316:623=92\\ x=92+8=100\)
Bài 13 : Tìm x
30240 : x = 42
x = 30240 : 42
x = 720
X x 12 = 2412
X = 2412 : 12
X = 201
57316 : ( X - 8 ) = 623
X - 8 = 57316 : 623
X - 8 = 92
X = 92 + 8
X = 100
( X + 3 ) x 247 = 10755
X + 3 = 10755 : 247
X + 3 = 10755/247
X = 10755/247 - 3
X = 10014/247
X x 37 = 1135
X = 1135 : 37
X = 1135/37
25 x X = 9100
X = 9100 : 25
X = 364
Bài 13
1.720 2.201 3.100 4.162 5. 1135/37 6.364
bài 14
( 367*584+12345 ) * ( 3570: 357 - 10)
= ( 367*584+ 12345 ) * ( 10-10 )
= ( 367*584+12345 ) * 0
= 0
(367*584+12345)*(3570:357-10)
=(367*584+12345)*(10-10)
=(367*584+12345)*0
=0
30240 : x = 42
x = 30240 : 42
x = 720
[ x + 3] x 247 = 40755
x + 3 = 40755 : 247
x + 3 = 165
x = 165 - 3
x = 162
57316 : [ x - 8 ] = 623
x-8 = 57316 : 623
x-8 = 92
x = 92 + 8
x = 100
x x 37 = 1147
x = 1147 : 37
x = 31
30240 : x = 42
x= 30240 : 42
x=720
(x + 3) x 247 = 40755
x + 3 = 40755 : 247
x + 3 = 165
x = 165 - 3
x = 162
57316 : (x - 8 )= 623
x- 8 = 57316 : 623
x- 8 = 92
x = 92 + 8
x = 100
X x 37 = 1147
X = 1147 : 37
X = 31
a) \(15400:x=25\)
\(\Rightarrow x=15400:25\)
\(\Rightarrow x=616\)
b) \(\left(x+3\right):247=675:135\)
\(\Rightarrow\left(x+3\right):247=5\)
\(\Rightarrow x+3=5\times247\)
\(\Rightarrow x+3=1235\)
\(\Rightarrow x=1235-3\)
\(\Rightarrow x=1232\)
c) \(1224:\left(x-8\right)=24\)
\(\Rightarrow\left(x-8\right)=1224:24\)
\(\Rightarrow x-8=51\)
\(\Rightarrow x=51+8\)
\(\Rightarrow x=59\)
49 x 37 = 37 x 49
(214 x 25) x 4 = 214 x (25 x 4)
103 x 18 + 103 x 12 = 103 x (18 + 12)
TL :
1) 112 x 5 x 2
= 112 x 10
=1120
2) 2 x 247 x 5
= 247 x 10
= 2470
3) 2 x 4 x 3 x 5
= 12 x 10
= 120
4) 20 x 7 x 5 x 8
= 100 x 56
= 5600
5) 25 x 35 x 4
= 100 x 35
= 3500
6) 47 x 7 + 47 x 3
= 47 x ( 7 + 3 )
= 47 x 10
= 470
7) 5 x 7 x 9 x 2
= 10 x 63
= 630
8) 125 x 9 x 7 x 8
= 1000 x 63
= 63000
9) 4 x 97 x 25
= 100 x 97
= 9700
10) 8 x 9 x 10 ( chắc thế )
= 80 x 9
= 720
11) 240 x 24 + 240 x 24
= 24 x ( 240 + 240 )
= 24 x 480
= 11520
12) 27 x 2 + 27 x 3 + 27 x 5
= 27 x ( 2 + 3 + 5 )
= 27 x 10
= 270
13) 48 x 4 + 48 x 3 + 48 x 2 + 48
= 48 x 4 + 48 x 3 + 48 x 2 + 48 x 1
= 48 x ( 4 + 3 + 2 + 1 )
= 48 x 10
= 480
14) 247 x 36 + 247 x 64
= 247 x ( 36 + 64 )
= 247 x 100
= 24700
15) 76 x 6 + 76 x 4
= 76 x ( 6 + 4 )
= 76 x 10
= 760
16) 249 x 101 - 249
= 249 x 101 - 249 x 1
= 249 x ( 101 - 1 )
= 249 x 100
= 24900
Mong các ban cho tui 10 cái T I C K
~HT~
a. 30240 : x = 42
x=30240:42
x=720
b. X x 12 = 2412
x=2412:12
x=201
c. X x 37 = 1135
x=1135:37
x=\(\frac{1135}{37}\)
d. 25 x X = 9100
x=9100:25
x=364
e. (x + 3) x 247 = 40755
x+3=40755:247
x+3=165
x=165-3
x=162
f. 57316 : (x - 8) = 623
x-8=57316:623
x-8=92
x=92+8
x=100
a. 30240 : x = 42
x=30240 : 42
x=720
b. X x 12 = 2412
x=2412:12
x=201
c. X x 37 = 1135
x=1135:37
x=30(dư 25)
d. 25 x X = 9100
x=9100:25
x=364
e. (x + 3) x 247 = 40755
x+3=40755:247
x+3=165
x=165-3
x=162
f. 57316 : (x - 8) = 623
x-8=57316:623
x-8=92
x=92+8
x=100