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Gọi A là biểu thức 1 + 2 + ...... + 100 ta được:
= A x ( 13 x 5 x 3 x 37 - 13 x 15 x 37 )
= A x ( 13 x 15 x 37 - 13 x 15 x 37 )
= A x 0
= 0
Vậy ( 1 + 2 + ...... + 100 ) x ( 65 x 111 - 13 x 15 x 37 ) = 0
Nhớ k cho mình nhé! Thank you!!!
A = (12+22+32+...+20142)x(65x111-13x3x5x37)
A = (12+22+32+...+20142)x(65x111-65x111)
A = (12+22+32+...+20142)x0
A = 0
7 x 17 x 125 = (8 x 125) x 17 = 1000 x 17 = 17000
4 x 37 x 25 = (25 x 4 ) x 7 = 100 x 7 = 700
43 x 27 + 93 x 43 + 57 x 81 + 69 x 57 = 43 x (27 + 93) + 57 x (81 +69) = 43 x 120 + 57 x 120 + 57x30 = 120 x (43 + 57) + 1710 = 12000 + 1710 = 13710
2.
\(\left(1+2+3+...+100\right)\cdot\left(1^2+2^2+3^2+...+10^2\right)\cdot\left(65\cdot111-13\cdot15\cdot37\right)\\ =\left(1+2+3+...+100\right)\cdot\left(1^2+2^2+3^2+...+10^2\right)\cdot\left(65\cdot111-13\cdot5\cdot3\cdot37\right)\\=\left(1+2+3+...+100\right)\cdot\left(1^2+2^2+3^2+...+10^2\right)\cdot\left[65\cdot111-\left(13\cdot5\right)\cdot\left(3\cdot37\right)\right]\\ =\left(1+2+3+...+100\right)\cdot\left(1^2+2^2+3^2+...+10^2\right)\cdot\left[65\cdot111-65\cdot111\right]\\ =\left(1+2+3+...+100\right)\cdot\left(1^2+2^2+3^2+...+10^2\right)\cdot0\\ =0\)
A, 210x13+210x65/28x104
=210x(13+65)/28x4x26
=210x78/28x22x26
=210x78/210x26
=78/26
=3
b, (1+2+3+...+100)x(12+22+32+...+102)x(65x111-13.15.37)
=(1+2+3+...+100)x(12+22+..+102)x(7215-7215)
=(1+2+..+100)x(12+22+..+102)x0
=0
Rin sẽ làm bài 2
a. 4 - 2x = -56
2x = 4 + 56
2x = 60
x = 30
b. -9x + 42 = 66
-9x = 24
x = 24 : -9
x = \(\frac{-24}{9}\)
c. 5 x 1x - 111 = 125
1x - 111 = 25
1x = 136
x = 136
d. (2x +1)2 = 81
(2x +1)2 = 92
=> 2x + 1 = 9
2x = 10
x = 5
(1900 - 2x) : 35 - 32 = 16
=> (1900 - 2x) : 35 = 48
=> 1900 - 2x = 1680
=> 2x = 220
=> x = 110
vậy_
111 + 1818 : (6x - 37) = 129
=> 1818 : (6x - 37) = 18
=> 6x - 37 = 101
=> 6x = 138
=> x = 23
vậy_
(x : 3 + 45) x 67 - 31 = 8880
=> (x : 3 + 45) x 67 = 8911
=> x : 3 + 45 = 133
=> x : 3 + = 88
=>x = 264
vậy_
(1+2+....+1000) x ( 111- 111) (1+2+....+1000) x0 = 0
(1+2+......+1000)x(111-111)=(1+2+....+1000)x0=0