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a) x*45-3209=13036
x*45 =13036+3209
x*45 =16245
x =16245:45
x =361
b) x:125*65=4608
x:8125=4608
x =4608*8125
x =37440000
c) x:48:25=374
x:48 =374*25
x:48 =9350
x =9350*48
x =448800
d)12925:x+3247=3522
12925:x =3522-3247
12925:x =275
x =12925:275
x =47
e) 17658:x-178=149
17658:x =149+178
17658:x =327
x =17658:327
x =54
g) 15892:x*96=5568
15892:x =5568:96
15892:x =58
x =15892:58
x =274
h)117504:x:72=48
117504:x =48*72
117504:x =3456
x =117504:3456
x =34
\(\left(x+268\right).137=48498\)
\(\Leftrightarrow x+268=48498:137\)
\(\Leftrightarrow x+268=354\)
\(\Leftrightarrow x=354-268\)
\(\Leftrightarrow x=86\)
b) \(\left(x+3217\right):215=348\)
\(\Leftrightarrow x+3217=348.215\)
\(\Leftrightarrow x+3217=74820\)
\(\Leftrightarrow x=74820-3217\)
\(\Leftrightarrow x=71603\)
c) \(\left(x-2048\right):145=246\)
\(\Leftrightarrow x-2048=246.145\)
\(\Leftrightarrow x-2048=35670\)
\(\Leftrightarrow x=35670+2048\)
\(\Leftrightarrow x=37718\)
d) \(\left(2043-x\right).84=132552\)
\(\Leftrightarrow2043-x=132552:84\)
\(\Leftrightarrow2043-x=1578\)
\(\Leftrightarrow x=2043-1578\)
\(\Leftrightarrow x=465\)
e) \(x.124+5276=48304\)
\(\Leftrightarrow x.124=48304-5275\)
\(\Leftrightarrow x.124=43028\)
\(\Leftrightarrow x=43028:124\)
\(\Leftrightarrow x=347\)
\(\Leftrightarrow2043-x=1578\)
a) ( x + 268 ) x 137 = 48498
( x + 268 ) = 48498
x + 268 = 354
x = 354 - 268
x = 86
a) x+678=2813
=>x=2813-678
=>x=2145
x x 23=3082
=>x= 3082:23
=>x=134
a. ( x + 268 ) x 137 = 48498
( x + 268 ) = 48498 / 137
x + 268 = 354
x = 354 - 268
x = 86
a) 12925 : x + 3247 = 3522
12925 : x = 3522 - 3247
12925 : x = 275
x = 12925 : 275
x = 47
b) 17658 : x - 178 = 149
17658 : x = 149 + 178
17658 : x = 327
x = 17658 : 327
x = 54
c) 15892 : x . 96 = 5568
15892 : x = 5568 : 96
15892 : x = 58
x = 15892 : 58
x = 274
Chúc bạn học tốt nhé :)
a) 12925 : x + 3247 = 3522
12925 : x = 3522 - 3247
12925 : x = 275
x = 12925 : 275
x = 47
b) 17658 : x - 178 = 149
17658 : x = 149 + 178
17658 : x = 327
x = 17658 : 327
x = 55,092
c) 15890 : x * 96 = 5568
15890 : x = 5568 : 96
15890 : x = 58
x = 15890 : 58
x = 273,45
K NHA MK XONG NHẤT ĐÓ
CHÚC BẠN HỌC TỐT
a) \(\left(145\times99+145\right)-\left(143\times102-143\right)\)
\(=\left[145\times\left(99+1\right)\right]-\left[143\times\left(102-1\right)\right]\)
\(=\left(145\times100\right)-\left(143\times101\right)\)
\(=14500-14443\)
\(=57\)
b) \(54\times47-47\times53-20-27\)
\(=47\times\left(54-53\right)-20-27\)
\(=47-20-27\)
\(=0\)
c) \(10000-47\times72-47\times28\)
\(=10000-47\times\left(72+28\right)\)
\(=10000-47\times100\)
\(=10000-4700\)
\(=5300\)
d) \(3457-27\times48-48\times73+6543\)
\(=\left(3457+6543\right)-48\times\left(27+73\right)\)
\(=10000-48\times100\)
\(=10000-4800\)
\(=5200\)
`@` `\text {Ans}`
`\downarrow`
`A.`
`x-56 \times 24 = 286`
`x-1344 = 286`
`x=286 + 1344`
`x=1630`
`B.`
`65 \times 54 - x = 1026`
`3510 - x =1026`
`x=3510 - 1026`
`x=2484`
`C.`
`36 \times 84 \div x = 72`
`3024 \div x = 72`
`x=3024 \div 72`
`x=42`
`D.`
`x \div 47 = 326 - 277`
`x \div 47 = 49`
`x= 49 \times 47`
`x=2303`
A. \(x-56\times24=286\\ x-1344=286\\ x=286+1344\\ x=1630\)
B. \(65\times54-x=1026\\ 3510-x=1026\\ x=3510-1026\\ x=2484\)
C. \(36\times84\div x=72\\ 3024\div x=72\\ x-3024\div72\\ x=42\)
D. \(x\div47=326-277\\ x\div47=49\\ x=49\times47\\ x=2303\)
Bài 1:
a) 43+45+47+...+565 [có (565-43)/2+1= 262 số hạng)
= [(565+43)*262]/2
= 79648
b) 21+24+27+...+318 [có (318-21)/3+1= 100 số hạng]
= [(318+21)*100]/2
= 16950
a/ = 113 x ( 54 + 45 + 1 ) = 113 x 100 = 11300
b/ = 47 x ( 54 - 53 ) - 20 - 27 = 47 - 20 - 27 = 0
c/ = 145 x ( 99 + 1 ) - 143 x ( 101 - 1 ) = 145 x 100 - 143 x 100 = 100 x ( 145 - 143 ) = 100 x 2 = 200
d/ = 1002 x 9 - 2 x 9 = 9 x ( 1002 - 2 ) = 9 x 1000 = 9000
e/ = 24 x 427 + 24 x 573 = 24 x ( 427 + 573 ) = 24 x 1000 = 24000
f/ Sửa đề bài là :
2008 x 867 + 2008 x 133 = 2008 x ( 867 + 133 ) = 2008 x 1000 = 2008000
TỰ TÚC LÀ HẠNH PHÚC
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