x*30%+x*1/4*89=100
X x 30 % + X x 1/4 + 89 = 100
x.3/10+x.1/4+89=100
x.(3/10+1/4)+89=100
x.11/20+89=100
x.11/20=100-89
x.11/20=11
x=11:11/20
x=20
X x 3/10 + X x 1/4 + 89 = 100
X x ( 3/10 + 1/4 ) + 89 = 100
X x 11/20 + 89 = 100
X x 11/20 = 100 - 89
X x 11/20 = 11
X = 11 : 11/20
X = 20
X x 30 % + X x 1/4 + 89 = 100
X x 3/10 + X x 1/4 + 89 = 100
X x ( 3/10 + 1/4 ) + 89 = 100
X x 11/20 + 89 = 100
X x 11/20 = 100 - 89
X x 11/20 = 11
X = 11 : 11/20
X = 20
Bài 1
a)50 % - 1/3 + 2/5 : 1/2
b)Tìm x
X * 30% + X * 1/4 +89 =100
GHi cả lời giải ra nhé bn
a = 1/2 - 1/3 + 2/5 : 1/2
= 1/6 + 4/5
= 29/30
b X x 3/10 + X x 1/4 + 89 = 100
X x ( 3/10 + 1/4 ) + 89 = 100
X x 11/20 + 89 = 100
X x 11/20 = 100 - 89
X x 11/20 = 11
X = 11 : 11/20
X = 20
415 x 530 =?
11/12+11/12x23+11/23+34+...+11/78+89+11/89+100 = ?
4^15 x 5^30 = 2^30 x 5^30 = 10^30
\(\frac{11}{1.12}+\frac{11}{12.23}+\frac{11}{23.34}+.......+\frac{11}{78.89}+\frac{11}{98.100}\)
\(=1-\frac{1}{12}+\frac{1}{12}-\frac{1}{23}+....+\frac{1}{89}-\frac{1}{100}\)
\(=1-\frac{1}{100}\)
\(=\frac{99}{100}\)
X x 30 % + X x 1/4 + 89 = 100
X + X x 0, 3 : 0, 5 + X : 0 , 25= 61 , 6
1987 : X = 55 ( dư 12 )
( X + 7,2 ) : 4, 2 = 12 ( dư 3, 2 )
Tìm X
Cần gấp ạ !!!!
Tính?
a) 24 x 30 36 x 40 72 x 60 89 x 50
Mẫu: 24 x 30 = (24 x 3) x 10 = 720
b) 130 x 20 450 x 70 2 300 x 500 17 000 x 30
Mẫu: 130 x 20 = (13 x 2) x 100 = 2 600
a,
36 x 40 = (36 x 4) x 10 = 144 x 10 = 1 440
72 x 60 = (72 x 6) x 10 = 432 x 10 = 4 320
89 x 50 = (89 x 5) x 10 = 445 x 10 = 4 450
b,
450 x 70 = (45 x 7) x 100 = 315 x 100 = 31 500
2300 x 500 = (23 x 5) x 10 000 = 115 x 10 000 = 1 150 000
17 000 x 30 = (17 x 3) x 10 000 = 510 000
Đề bài là:Tìm x:(1/1*2+1/1*3+1/3*4+...+1/8*9+1/9*10)*100-(5/2÷(x+206/100)÷1/2)=89
dai gia dinh online math oi, giup minh di cac ban
Tìm x: (1/1×2+1^2×3+1/3×4+........+1/8×9+1/9×10) ×100-[5/2÷(x+206/100)÷1/2]=89
( 1/1x2 + 1/2x3 + 1/3x4 + ... + 1/9/10 ) x 100 - ( 5/2 : ( x + 206/100 ) : 1/2 = 89