4^x.5^x = 400
5 x X +4 x X + x = 400
giup gấp
5 x X + 4 x X + x = 400
X x ( 5 + 4 + 1 ) = 400
X x 10 = 400
X = 400 : 10
X = 40
Vậy: X = 40
Nhớ k cho mình nhé! Thank you!!!
5 x X +4 x X+x=400
X x (5+4+1) =400
X x 10=400
X=400 : 10
X=40
a) x^2 + căn (2x-1)=4 + căn (x-1)
b)x^2 +(400/x^2)=35 +24[(5/x)-(x/4)]
Tìm x Z:
a) −1+3−5+7−...+x=200; b) −4+6−8+...−x=−400
Tính nhẩm:
a) 2 x 2 = ...... 3 x 3 = ......
2 x 4 = ...... 3 x 5 = ......
2 x 6 = ...... 3 x 7 = ......
2 x 8 = ...... 3 x 9 = ......
4 x 4 = ...... 5 x 5 = ......
4 x 2 = ...... 5 x 7 = ......
4 x 6 = ...... 5 x 9 = ......
4 x 8 = ...... 5 x 3 = ......
b) 200 x 4 = ...... 300 x 2 = ......
200 x 2 = ...... 300 x 3 = ......
400 x 2 = ...... 500 x 1 = ......
100 x 4 = ...... 100 x 3 = ......
a) 2 x 2 = 4 3 x 3 = 9
2 x 4 = 8 3 x 5 = 15
2 x 6 = 12 3 x 7 = 21
2 x 8 = 16 3 x 9 = 27
4 x 4 = 16 5 x 5 = 25
4 x 2 = 8 5 x 7 = 35
4 x 6 = 24 5 x 9 = 45
4 x 8 = 32 5 x 3 = 15
b) 200 x 4 = 800 300 x 2 = 600
200 x 2 = 400 300 x 3 = 900
400 x 2 = 800 500 x 1 = 500
100 x 4 = 400 100 x 3 = 300
Trả lời 1 câu thôi nhé em 100 nhân 4 bằng 400 nhá em
a) 2 x 2 =4 ...... 3 x 3 = ..9....
2 x 4 = ....8.. 3 x 5 = ...15...
2 x 6 = ....12.. 3 x 7 = .21.....
2 x 8 = ..16.... 3 x 9 = ..27....
4 x 4 = ...16... 5 x 5 = ...25...
4 x 2 = ...8... 5 x 7 = ..35....
4 x 6 = .....24. 5 x 9 = .45.....
4 x 8 = ..32.... 5 x 3 = .15.....
b) 200 x 4 = 800...... 300 x 2 =600 ......
200 x 2 = ..400.... 300 x 3 = 900......
400 x 2 = .....800. 500 x 1 = ..500....
100 x 4 = ....400.. 100 x 3 = .300.....
(x - 1) ∈ BC(4; 5; 6) và x < 400 Ai biet Làm ko
4 = 2²
5 = 5
6 = 2.3
⇒ BCNN(4; 5; 6) = 2².3.5 = 60
⇒ x - 1 ∈ BC(4; 5; 6) = B(60) = {0; 60; 120; 180; 240; 300; 360; 420; ...}
⇒ x ∈ {1; 61; 121; 181; 241; 301; 361; 421; ...}
Mà x < 400
⇒ x ∈{1; 61; 121; 181; 241; 301; 361}
4=22
5=5
6=2.3
Cac thua so nguyen to chung va rieng la :2;3;5
BCNN(4,5,6)=22.3.5=4.3.5=60
x-1 ϵ BC(4,5,6)=B(60)={0;1;2;3;4;5;6;10;12;15;20;30;60}
xϵ{1;2;3;4;5;6;7;11;13;16;21;31;61}
vay xϵ{1;2;3;4;5;6;7;11;13;16;21;31;61}
xin loi toi viet ko dau
\((2 x -1) + (4 x - 2 )+ ...... + (400 x - 200)=5 + 10 + ........ + 1000\)
Đề mk ko ghi lại nữa nha bạn.
Ta có: (2x-1)+(4x-2)+(6x-3)+......+(400x-200) = 5+10+15+.......+1000
=> (2x-1)(1+2+3+...+200) = 100500
=> (2x-1) . 20100 = 100500
=> 2x-1 = 5
=> x = 3 (t/m)
Chức bạn học tốt!!
Giải phương trình ẩn t =\(\frac{5}{x}-\frac{x}{4}\)
\(x^2+\frac{400}{x^2}=35+24\left(\frac{5}{x}-\frac{x}{4}\right)\)
Tính nhẩm
a) 2 x 6 = ...... 3 x 7 = ......
12 : 2 = ...... 21 : 3 = ......
12 : 6 = ...... 21 : 7 = ......
4 x 8 = ...... 5 x 9 = ......
32 : 4 = ...... 45 : 5 = ......
32 : 8 = ...... 45 : 9 = ......
b) 600 : 3 = ...... 800 : 4 = ...... 400 : 2 = ......
600 : 2 = ...... 800 : 2 = ...... 500 : 5 = ......
) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
Tính nhẩm
a)2×6=12 3×7=21
12:2=6 21:3=7
12: 6=2 21:7=3
4×8=32 5×8=45
32:4=8 45:5=9
32:8=4 45:9=5
b)600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
-1 + 3 - 5 + 7 -.......+ x = 200
2 - 4 + 6 - 8 +........- x = - 400