4^19 . 4 : 4^20 : 2016^0
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\(\left(-\frac{1}{2}\right)^2\div\left(-\frac{1}{4}\right)-2\times\left(-\frac{1}{2}\right)^3+\left(25-23\right)^2\)
\(=\frac{1}{4}\div\left(-\frac{1}{4}\right)-2\times\left(-\frac{1}{8}\right)+2^2\)
\(=-1+\frac{1}{4}+4\)
\(=\frac{13}{4}\)
*****
\(25^{10}\times\left(\frac{1}{5}\right)^{20}+\left(-\frac{3}{4}\right)^8\times\left(-\frac{4}{3}\right)^8-2016^0\)
\(=25^{10}\times\left[\left(\frac{1}{5}\right)^2\right]^{10}+\left[\left(-\frac{3}{4}\right)\times\left(-\frac{4}{3}\right)\right]^8\)
\(=25^{10}\times\left(\frac{1}{25}\right)^{10}+1^8-0\)
\(=\left(25\times\frac{1}{25}\right)^{10}+1\)
\(=1^{10}+1\)
= 1 + 1
= 2
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a) 13 x A + 5 x B + 13 x B + 5 x A
= ( 13 x A + 13 x B ) + ( 5 x B + 5 x A )
= 13 x ( A + B ) + 5 x ( B + A ) mà A + B = 12
=> 13 x ( A + B ) + 5 x ( B + A )
= 13 x 12 + 5 x 12
= 12 x ( 13 + 5 )
= 12 x 18
= 216
b) 4 x A + 25 x B + 16 x A - 5 x B
= ( 4 x A + 16 x A ) + ( 25 x B - 5 x B )
= A x ( 4 + 16 ) + ( 25 - 5 ) x B
= A x 20 + 20 x B
= 20 x ( A + B ) mà A + B = 12
=> 20 x ( A + B )
= 20 x 12
= 240
Trả lời :
a) 13 x A + 5 x B + 13 x B + 5 x A
= 13 x (A + B)+ 5 x (A + B)
= (13 x 12) + (5 x 12)
= 156 + 60
= 216
b) 4 x A + 25 x B + 16 x A - 5 x B
= 25 + 4 x (A + B) + 16 - 5 x (A + B)
= 29 x 12 + 11 x 12
= 348 + 132
= 480
T i c k nha !!
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1/ \(-12;-7;-1;0;4;10;\left|-18\right|\)
2/ \(-13;-5;0;+3;\left|+4\right|;12;\left|-15\right|\)
3/ \(\left|-26\right|;19;-\left(-12\right);0;-4;-\left|35\right|\)
4/ \(-\left(-73\right);\left|+7\right|;4;\left|-1\right|;0;+\left(-5\right);-\left(+22\right)\)
Bài 20:
*Tăng dần
1/ -12; -7; -1; 0; +4; 10; |-18|
2/ -13; -5; 0; +3; |+4|; 12; |-15|
*Giảm dần
3/ |-26|; +19; -(-12); 0; -4; -|-35|
4/ -(-73); | +7|; 4; |-1|; 0; +(-5); -(+22)
Chúc bạn học tốt !!!