(x+2)+(x+4)+(x+6)+...+(x+100)=2496
a. Tìm y biết: y x 8 = 6480
b. Tính giá trị biểu thức: 6 x (3875 – 2496)
a. y x 8 = 6480
y = 6480 : 8
y = 810
b. 6 x (3875 – 2496) = 6 x 1379 = 8274
(2496-x):54=43
(2496-x):54=43
2496 - x = 43 x 54
2496 - x = 2322
x = 2496 - 2322
x = 174
(2496-x):54=43
2496-x=43x52
2496-x=2322
x=2496-2322
x=174
2496 - x = 43 . 54
2496-x = 2322
x = 2496 - 23322
x =174
4 x 2 : 2 x 3 : 3 x 4 : 4 x........x 100 : 100 + 6 x 1 : 1 x 2 : 2 x 3 : 3 x 4 : 4 x........x 1000 : 1000 x4
giúp nhanh
756 = 700 + 50 + ….. = 7 x 100 +……. x 10 + 6 b) 862 = …….. x 100 + …….. x 10 + 2 4 x 2 + 4 x 5 + 4 =…………………….. a x 7 + a x 2 + a =……………………. c) abc = ….. … x 100 +……… x 10 + …….
756 = 700 + 50 + 6 hoặc 7 x 100 + 5 x 10 + 6 x 1
862 = 8 x 100 + 6 x 10 + 2
HT
a) 756 = 700 + 50 + 6 = 7 x 100 + 5 x 10 + 6
b) 862 = 8 x 100 + 6 x 10 + 2
c) 4 x 2 + 4 x 5 + 4 = 4 x (2 + 5 + 1) = 4 x 8 = 32
d) a x 7 + a x 2 + a = a x (7 + 2 + 1) = a x 10 = a0
e) abc = a x 100 + b x 10 + c
Chúc bạn học tốt.
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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.....
Bài 6 Tìm x
1) ( x+1 ) + ( x+2 ) + ( x+3 ) + ... + ( x+100 ) = 5750
2) ( 2x-1 ) + ( 4x-2 ) + ... + ( 200x - 100 ) = 5050
3) ( x+2 ) + ( x+4 ) + ( x+6 ) + ... + ( x + 100) = 2650
(2496-x):54=43
(2496-x):54=43
2496 - x = 43 x 54
2496 - x = 2322
x = 2496 - 2322
x = 174
tích nha !!!
( 2496 - x ) : 54 = 43
2496 - x = 54 x 43
2496 - x = 2322
x = 2496 - 2322
x = 174
Nhớ tick cho mik nha !!!
1/2 x -2/3 x 3/4 x -4/5 x 5/6 x -6/7 x ....x 99/100 = ?
=1x-2x3x-4x...x99/2x3x4x5x6x...x100=-1/100
Cho A = 1 x 2 + 2 x 3 + 3 x 4 + 4 x 5 + ... + 100 x 101
và B = 1 x 3 + 2 x 4 + 3 x 5 + 4 x 6 + ... + 100 x 102
Vậy B - A = ?
Ta có : A = 1.2 + 2.3 + 3.4 + ...... + 100.101
=> 3A = 1.2.3 - 1.2.3 + 2.3.4 - 2.3.4 + ...... + 100.101.102
=> 3A = 100.101.102
=> A = 100.101.102/3
=> A = 343400