( x+ 2) -26= ( 43 - 32 .7)100.
Tìm x
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Đặt A=18 * 32 + 43 * 18 + 18 * 26 - 18
=18*(32+43+26-1)
=18*100
=1800
Đặt B=1 + 4 + 7 + 10 + .......+ 94 + 97 + 100
Tổng B có số số hạng là:
(100-1):3+1=34 (số)
tổng B là:
(100+1)*34:2=1717
Thay vào ta có \(\frac{A}{B}=\frac{1800}{1717}\)
=[18.(32+43+26-1)]:(1+4+7+10+...+94+97+100)
=[18.100]:[(100-1):3+1]
=1800:[(1+100).34:2]
=1800:1717
=1800/1717
18
1. \(x-8+32=68\)
\(x-8=68-32\)
\(x-8=36\)
\(x=36+8\)
\(x=44\)
_____
2. \(x+8+32=68\)
\(x+8=68-32\)
\(x+8=36\)
\(x=36-8\)
\(x=28\)
_____
3. \(98-x+34=43\)
\(98-x=43-34\)
\(98-x=9\)
\(x=98-9\)
\(x=89\)
_____
4. \(98+x-34=43\)
\(98+x=43+34\)
\(98+x=77\)
\(x=77-98\)
\(x=-21\)
_____
5. \(x:5:4=800\)
\(x:5=800.4\)
\(x:5=3200\)
\(x=3200.5\)
\(x=16000\)
_____
6. \(18+x=384:8\)
\(18+x=48\)
\(x=48-18\)
\(x=30\)
_____
7. \(\left(84,6-2\times x\right):3,02=5,1\)
\(84,6-2.x=5,1.3,02\)
\(84,6-2.x=15,402\)
\(2.x=84,6-15,402\)
\(2.x=69,198\)
\(x=69,198:2\)
\(x=34,599\)
_____
8. \(x\times5=120:6\)
\(x.5=20\)
\(x=20:5\)
\(x=4\)
_____
9. \(\left(15\times24-x\right):0,25=100:0,25\)
\(\left(15.24-x\right):0,25=400\)
\(15.24-x=400.0,25\)
\(15.24-x=100\)
\(360-x=100\)
\(x=360-100\)
\(x=260\)
1,x-8+32=68
=>x-8=68-32=36
=>x=36+8=42
2,x+8+32=68
=>x+8=68-32=36
=>x=36-8=28
3,98-x+34=43
=>98-x=43-34=9
=>x=98-9=89
4,98+x-34=43
=>98+x=43+34=77
=>x=77-98=-21
5,x:5:4=800
=>x:20=800
=>x=800x20=16000
6,18+x=384:8=48
=>x=48-18=30
7,(84,6-2x):3,02=5,1
=>84,6-2x=5,1x3,02=15,402
=>2x=84,6-15,402=69,198
=>x=69,198:2=34,599
8,5x=120:6=20
=>x=20:5=4
9,(15x24-x):0,25=100:0,25=400
=>360-x=400x0,25=100
=>x=360-100=260.
Bài 6:
\(21,251+6,058+0,749+1,042\)
\(=\left(21,251+0,749\right)+\left(6,058+1,042\right)\)
\(=22+7,1\)
\(=29,1\)
___________________
\(1,53+5,309+12,47+5,691\)
\(=\left(1,53+12,47\right)+\left(5,309+5,691\right)\)
\(=14+11\)
\(=25\)
5:
a: =>x/17=5/17
=>x=5
b; =>6+x=7/11*33=21
=>x=15
c: \(\dfrac{12+x}{43-x}=\dfrac{2}{3}\)
=>3x+36=86-2x
=>5x=50
=>x=10
d: \(\dfrac{x}{5}< \dfrac{3}{7}\)
=>x<3/7*5
=>x<15/7
f: 15/26+x/16=46/52
=>x/16=23/26-15/26=8/26=4/13
=>x=4/13*16=64/13
1, -15 + \(x\) = -14 - (-57)
-15 + \(x\) = -14 + 57
\(x\) = -14 + 57 + 15
\(x\) = 43 + 15
\(x\) = 58
2, (-14) + \(x\) - 7 = -10
-14 + \(x\) - 7 = -10
- 21 + \(x\) = - 10
\(x\) = -10 + 21
\(x\) = 11
\(18\times32+43\times18+18\times26-18\)
\(=18\times\left(32+43+26-1\right)\)
\(=18\times100\)
\(=1800\)
18 * 32 + 43 * 18 + 18 * 26 - 18
= 18 * ( 32 + 43 + 26 - 1 )
= 18 * 100
= 1800
Có số số hạng là :
( 100 - 1 ) : 3 + 1 = 34 ( số )
Tổng là :
( 100 + 1 ) x 34 : 2 + 83 = 1800
a) (-125) . 25 . (-32) . (-14)
= [-125 . (-14)] . 25 . (-32)
= 1750 . 800
= 1400000
còn lại tự làm nhé!! 467568768578769789578797808096585
(x+2)-26=\(\left(64-9.7\right)^{100}\)
(x+2)-26=\(\left(64-63\right)^{100}\)
(x+2)-26=\(1^{100}\)
x+2=1+26=27
x=27-2=25