\(\frac{234^4}{117^4}-4^{10}:8^{13}\)

\(=2^4-2^{20}:2^{39}\)

\(=2^4-2^{-19}\)

Tính ra số dài lắm.

Câu 2: a) 234-117+(-100)+(-234)=[234+(-234)]-117-100=0-117-100=-217

b) -927+1421+930+(-1421)=-927+930+[1421+(-1421)]=-927+930+0=3

Bài 1:

s1=1+(-3)+5+(-7)+............+17

s2=-2+4+(-6)+8+...........+(-18)
\(\Rightarrow\) s1 + s2 = (1-2-3+4)+(5-6-7+8)+...+(13-14-15+16)+17-18

= 0 + 0 + ...+ 0 + (-1)

= -1

Bài 2.

a) 234-117+(-100)+(-234)

= (-234 + 234 ) + [- 117 + (-100)]

= 0 + (-217)

= -217

b) -927+1421+930+(-1421)

= ( -1421 + 1421 ) + ( -927 + 930 )

= 0 + 3

= 3

a: \(\left(24-234\right)+\left(234-24-77\right)\)

\(=24-234+234-24-77\)

\(=\left(24-24\right)+\left(234-234\right)-77\)

=0+0-77

=-77

b: \(\left(13-135+49\right)-\left(13+49\right)\)

\(=13-135+49-13-49\)

\(=\left(13-13\right)+\left(49-49\right)-135\)

=0+0-135

=-135

c: \(159-524-\left(59-424\right)\)

\(=159-524-59+424\)

\(=\left(159-59\right)-\left(524-424\right)\)

=100-100

=0

d: \(\left(36+79\right)+\left(145-79-36\right)\)

\(=36+79+145-79-36\)

\(=\left(36-36\right)+\left(79-79\right)+145\)

=0+0+145

=145

e: \(334-\left(117+234\right)+\left(42+117\right)\)

\(=334-117-234+42+117\)

\(=\left(334-234\right)+\left(117-117\right)+42\)

=100+0+42

=142

f: \(271-\left[\left(-43\right)+271-\left(-17\right)\right]\)

\(=271+43-271+\left(-17\right)\)

\(=\left(271-271\right)+\left(43-17\right)\)

=0+26

=26

a: =234x(45+54+1)

=234x100

=23400

b: =(8x125)x(50x20)

=1000x1000

=1000000

a = 243x(45+54+1)

=243 x 100

=24300

b = (20 x 50 ) x (8x125)

=1000x1000

=1000000

a) 234 x 45 + 54 x 234 + 234

= 234 x (45+54+1) = 234 x 100 = 23400

b) 50 x 8 x 125 x 20 = (50 x 20) x (8 x 125)

= 1000 x 1000 = 1000000

a) 234 - 117 + (-100) + (-234) = [234 + (-234)] - [117 + (-100)] = 0 + 17 = 17.

b) (-927) + 1421 + 930 + (-1421) = [(-927) + 927)] + (1421 + 930) = 0 + 2351 = 2351.

c) 11 - 12 + 13 - 14 + 15 - 16 + 17 -18 + 19 - 20 = (11 - 20) + (12 - 19) + (13 - 18) + (14 - 17) + (15 - 16)

= (-9) + (-7) + (-5) + (-3) + (-1) = -25.

d) 101 - 102 - (-103) - 104 - (-105) - 106 - (-107) - 108 - (-109) - 110

= (-101) + (-102) + 103 + (-104) + 105 + (-106) + 107 + (-108) + 109 + (-110)

=               (-203) +                      (-205) +           (-204) +           (-203) + (-110)

= -925.

e) (-125) + 100 + 80 + 125 + 20 = [(-125) + 125] + 100 + (80 + 20) = 0 + 100 + 100 = 200.

a=4099/308

b=2/5/186

a)-(2x + 15 ) + 13 = -234

\(\Leftrightarrow\)-2x-15+13+234=0

\(\Leftrightarrow\)2x=232

\(\Leftrightarrow\)x=116

b)2+4+6+8 +..............+2x=182

\(\Leftrightarrow\)2(1+2+3+4+.....+x) =182

\(\Leftrightarrow\)1+2+3+4+.....+x= 182/2 = 91

\(\Leftrightarrow\)x(x+1)/2 =91

\(\Leftrightarrow\)x(x+1)= 182

\(\Leftrightarrow\)x(x+1) = 13(13+1)

\(\Leftrightarrow\)\(\hept{\begin{cases}x=13\\x+1=13+1\end{cases}}\Leftrightarrow x=13\)

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