1, 182
2,1501
3,102
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708-3:(x+3 mu 1)=407
2.x+15=134:2
114-2.(2x+11)=80
12.x-33=3 mu 2. 3 mu3
200-8.(2.x+7)=112
2 mu 4:(x+1)+2=6
2448-(5.x+148)=2. 10 mu 3
125:x+100=125
2.x-138=8.9
145-x=98+32
Giup em giai nhung bài nay ho a
giup minh giai toan
a, (-3)-12.(+5)-(-5).(-7)2
b,55-(-135)+64-(48+112)
c,(-2).12.(+3)-(-7).(-5)2
ban nao giai chi tiet nhat minh tick cho
( x - 1 ) mu 2 : 5 mu 21 = 25 mu 30 . 5
2.3 mu x + 1 = 10.3 mu 12 + 8 : 27 mu 4
( 19x + 2 .5 mu 2) : 14 = ( 13 - 8 ) mu 2
1351 - 2 . ( x + 3) = 4 mu 12 : 8 mu 7 + 3
mong m.n giup mk vs !!!!
a, 5x - 10 . ( - 7 ) = 15 .( - 3 )
b, 2x + 12 = - 8
c, 3x - 5 = - 20
d, 2x - ( - 12 ) = ( - 8 ) . 23
e, x mu 2 = 49
i, ( x - 2 ) mu 2 + 1 = 65
g , 2. ( x - 3 ) mu 2 - 5 = 5 . ( - 3 ) mu 2
a) 2345-1000:[19-2(21-18)mu 2]
b)107-{38+[7.3 mu 2-24:6+(9-7) mu 3]} :15
c) 10- [(2 mu 2-48).5+(2 mu 3 .10+8)]:28
2) tim so tu nhien a,biet rang a gan den 1000,a:12,a:21 deu co du la 5
3) tim boi chung lon hon 5000 be hon 10000 cua cac so 126;140;180.
bai 1; cho tong M =126 +213+x. Tim x de M chia het cho 3
bai 2; chung to rang tong ; A= 2 + 2 mu 3 + 2 mu 4 + 2 mu 5 + 2 mu 6 +2 mu 7 +2 mu 9 + 2 mu 10 + 2 mu 12 chia het cho 5
tim n E N;
A, 2 mu 2 =32
27. 3 mu n= 243
64. 4mu n=4 mu 5
9 mu 2.3 mu n=3 mu 7
Rut gon cac phan so
a) -21 / 49 ; 39 / -65
b ) 5 mu 4 . 7 mu 3 / 5 mu 5 . 7 mu 2 ; 2 mu 2 . 3 mu 5 . 5 / 2 mu 4 . 3 mu 4 . 5 mu 2
B=1/3+1/3 mu 3 +1/3 mu 5 +1/3 mu 7 + ...+1/3 mu 99
M= 3/1 mu 2 . 2 mu 2 +5/2 mu 2 . 3 mu 2+7/3 mu 2 . 4 mu 2 + ...+19= 9 mu 2 . 10 mu 2