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12x18+14x3-255:17
=216+42-15
=258-15
=243
68+42x5-625:25
=68+210-25
=278-25
=253
13+21x5-(198/11-8)
=13+105-(18-8)
=13+105-10
=118-10
=108
272:16-5+4x(30-5-255:17)
=17-5+4x(30-5-15)
=17-5+4x(25-15)
=17-5+4x10
=17-5+40
=12+40
=52
25x8-12x5+272:17-8
=200-60+16-8
=140+16-8
=156-8
=148
A=71 38/45-(43 8/45 + 1 17/57)
=( 71 38/45-43 8/45 )+ 1 17/57
= 28 2/3 + 1 17/57
= 29 55/57
\(A=71\frac{38}{45}-\left(43\frac{8}{45}+1\frac{17}{57}\right)\)
\(A=\frac{3233}{45}-\left(\frac{1943}{45}+\frac{74}{57}\right)\)
\(A=\frac{3233}{45}-\frac{1943}{45}-\frac{74}{57}\)
\(A=\frac{86}{3}-\frac{74}{57}=\frac{520}{19}\)
Ta có : \(5\frac{8}{17}\div X+\left(-\frac{1}{17}\right)\div X+3\frac{1}{17}\div17\frac{1}{3}=\frac{4}{17}\)
Nên: \(\left(5\frac{8}{17}+\left(-\frac{1}{17}\right)\right)\div X+\frac{52}{17}\div\frac{52}{3}=\frac{4}{17}\)
\(5\frac{7}{17}\div X+\frac{52}{17}\times\frac{3}{52}=\frac{4}{17}\)
\(\frac{92}{17}\div X+\frac{3}{17}=\frac{4}{17}\)
\(\frac{92}{17}\div X=\frac{4}{17}-\frac{3}{17}\)
\(\frac{92}{17}\div X=\frac{1}{17}\)
\(X=\frac{92}{17}\div\frac{1}{17}\)
\(X=92\)
Vậy \(X=92\)
\(5\frac{8}{17}:x+\left(-\frac{1}{17}\right):x=\frac{52}{51}\)
\(\left(5\frac{8}{17}+-\frac{1}{17}\right):x=\frac{52}{51}\)
\(\frac{92}{17}:x=\frac{52}{51}\)
\(X=\frac{92}{17}:\frac{52}{51}=\frac{69}{13}\)
Đây là thực hiện phép tính nha các bạn, mình xin cảm ơn mình đang cần gấp.
\(16+\left(-6\right)+\left(-8\right)+7\)\(=16-6-8+7\)\(=\left(16-6\right)-\left(8-7\right)\)\(=10-1=9\)
\(\left(-8\right)-[\left(2015^0\right)-14+7]\)\(=-8-\left(1-14+7\right)\)\(=-8-\left(-6\right)=-2\)
\(\left(-31\right)-[82-\left(-17\right)]\)\(=-31-\left(82+17\right)\)\(=-31-99=-130\)
\(6\left(-2\right)^3+5\left(-4\right)-\left(-12\right)\)\(=6\left(-8\right)+\left(-20\right)+12\)\(=-48-20+12=-56\)
\(\frac{\left(3x+4\right)}{5}=8\Leftrightarrow3x+4=40\Leftrightarrow x=12\)
\(\frac{17\left(x-12\right)}{11}=51\Leftrightarrow17x-204=561\Leftrightarrow x=45\)
\(4,8x+5,2x=160\Leftrightarrow x\left(4,8+5,2\right)=160\Leftrightarrow10x=160\Leftrightarrow x=16\)
(3* x + 4 ) : 5 = 8 ( x - 12 ) * 17 : 11 = 51 4.8 * x + 5.2 * x = 160
(3* x +4 ) = 8 x5 ( x - 12 ) * 17 = 51 x 11 x * ( 4.8 + 5.2 ) = 160
( 3 * x + 4) = 40 ( x - 12 ) * 17 = 561 x * 10 = 160
3 * x = 40 - 4 x - 12 = 561 : 17 x = 160 : 10
3 * x = 36 x - 12 = 33 x = 16
x = 36 : 3 x = 33 + 12
x = 12 x = 45
=200-12,5+10-8
=187,5+10-8
=197,5-8
=189,5
chúc bạn học tốt
25 x 8 - 12,5 + 170 : 17 - 8
=200 - 12,5 + 10 - 8
=187,5 + 10 - 8
=197,5 - 8
=189,5