200:(x+5)=8
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.....
tìm x
137 + 4 ( 2x + 3) =200
200-6 . ( x-5) = 140
140 : (x-8)=7
giải hết cho tick
137+4 (2x+3)=200(hình như đề bài sai)
200-6(x-5)=140
6(x-5)=200-140
6(x-5)=60
x-5=60:6
x-5=10
x=10+5
x=15
140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
137+4(2x+3)=200
4(2x+3)=200-137
4(2x+3)=63
2x+3=63:4
2x+3=\(\frac{63}{4}\)
2x=\(\frac{63}{4}\)-3
2x=\(\frac{51}{4}\)
x=\(\frac{51}{4}\):2
x=\(\frac{51}{8}\)
Vậy ...
200-6(x-5)=140
6(x-5)=200-140
6(x-5)=60
x-5=60:6
x-5=10
x=15
Vậy...
140:(x-8)=7
x-8=140:7
x-8=20
x=20+8
x=28
Vậy...
k mik nhé
137 + 4 ( 2x + 3) =200
4 (2x+3)=200-137
4 (2x+3)= 63
(2x+3)=63:4
2x+3= 15,75
2x =15,75-3
2x = 12,75
x =12,75:2
x =6,375
200-6 . ( x-5) = 140
6 (x-5) = 200-140
6 (x-5) = 60
(x-5) =60:6
x-5 = 10
x =10-5
x =5
140 : (x-8)=7
(x-8)=140:7
x-8= 20
x =20+8
x=28
x+10=-14
x-7=-5
|x|+5=8
5x-12=48
82+{200-x}=123
Tìm x Z:
a) −1+3−5+7−...+x=200; b) −4+6−8+...−x=−400
-1 + 3 - 5 + 7 -.......+ x = 200
2 - 4 + 6 - 8 +........- x = - 400
x/2008-1/10-1/15-1/20-...-1/200=5/8
a) 6-8+10-12+...-x=-75
b) 6-8+10-12+...-x=-200
c) 1-3+5-7+...-x=600
x chia cho 3, chia cho 5, chia cho 8 cùng dư 2 và 200 < x < 300
Lời giải:
Vì $x$ chia $3,5,8$ đều dư $2$ nên $x-2\vdots 3,5,8$
$\Rightarrow x-2\vdots BCNN(3,5,8)$
$\Rightarrow x-2\vdots 120$
$\Rightarrow x-2\in\left\{0;120;240;360;...\right\}$
$\Rightarrow x\in\left\{2;122;242;362;...\right\}$
Mà $200< x< 300$ nên $x=242$
Tìm x biết :
a) 6 - 8 + 10 - 12 + ... - x = -200
b) 1 - 5 + 9 - 13 + ... -x = -400
c) -8 + 13 - ... + x = 250
d) 1 - 3 + 5 - 7 + ... - x = -600