1) 5^2 . x + 2^4 . x = 123
=> 25 .x + 16 .x = 123
=> x ( 25 + 16 ) = 123
=> x . 41 = 123
=> x = 123 : 41
=> x = 3
b, 3^6 : 3 ^ 3 + 5.x = 57
=> 3^3 + 5.x = 57
=> 27 + 5x = 57
=> 5x = 57 - 27
=> 5x = 30
=> x = 30 : 5
=> x = 6
1) 5^2 . x + 2^4 . x = 123
=> 25 .x + 16 .x = 123
=> x ( 25 + 16 ) = 123
=> x . 41 = 123
=> x = 123 : 41
=> x = 3
b, 3^6 : 3 ^ 3 + 5.x = 57
=> 3^3 + 5.x = 57
=> 27 + 5x = 57
=> 5x = 57 - 27
=> 5x = 30
=> x = 30 : 5
=> x = 6
6^2 : 4 x 3 + 2 x5^2
5 x 4^2 - 18 : 3^2
80 - (4 x 5^2 - 3 x 2^3)
23 x 75 + 25 + 23 +180
2448 : [199 - (26-6)]
Tính tổng
A=1 x 5 x 51 x52 x 53x54x55x56x57x58x59x510
TÌM Y BIẾT:
a) y x 4/3= 16/9
b) (y-1/2)+0,5=3/4
c) 4/5-2/5 x y=0,2
d) (y+3/4)x5/7=10/9
e) y : 5/4=9/5+1/2
f) y x 1/2+3/2x y=4/5
-5.(x+1/5)-1/2.(x-2/3)=3/2.x5/6
tìm x
a) 5,2x+7 2/5= 6 3/4
b) ( x-5/8)x5/18=-15/36
c) 2,4:( -1/2-x)= 1 3/5
d)3-(1/6-x)x2/3=2/3
mỗi bn làm 1 phép kiểu gì cũng hết nha
ngày kia mình phải nộp rồi các bn giúp mình với
1. x - 8 +32= 68
2. x +8+32=68
3. 98-x +34=43
4. 98+x-34=43
5. x :5:4=800
6. 18+x=384:8
7. (84,6-2 x x):3,02= 5,1
8. x x5= 120:6
9. (15x 24-x) :0,25= 100:0,25
Tính giá trị biểu thức:
A=2^3 x 5^3 - {7^3 x 2^3 - 5^2 x [4^3 x 8+11^0 : 121 - 2(87- 57)]}
B=12 x 94 + 6 x 437 x 2 + 3 x 369 x 4
1x 3 + 2 x 4 + 3 x5 + 4 x 6 + ...+199x 201+ 200 x 202
1, (2+4+6+...+100)
2, 10-(3-x)=-10+17
3, 17-(3+x)=2-(7-8)
4, (5+x)-(15-31)=-20
5, 17-(3+x)+15-3=2
6, (41-x)-(13-17)=40-50
7, -(52-x)+(40-42)=-57+13