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\(\left[504-\left(5^2.8+70\right):3^3+6\right]:25\)
\(\left[504-\left(25.8+70\right):27+6\right]:25\)
\(\left[504-\left(200+70\right):27+6\right]:25\)
\(\left[504-270:27+6\right]:25\)
\(\left[504-10+6\right]:25\)
\(\left[494+6\right]:25\)
\(500:25\)
= 20
\(\left[504-(5^2\cdot8+70):3^3+6\right]:25\)
\(=\left[504-(25\cdot8+70):27+6\right]:25\)
\(=\left[504-(200+70):27+6\right]:25\)
\(=\left[504-270:27+6\right]:25\)
\(=\left[504-10+6\right]:25\)
\(=\left[494+6\right]:25\)
\(=500:25=20\)
\(\text{Ko chắc }:)\)
a)\(\left(-3\right).8.\left(-2\right).5=\left(-3\right).\left(-2\right).8.5\)
\(=6.40=240\)
b)\(127-18.\left(5+6\right)=127-18.11\)
\(=127-198=-71\)
c)\(125-\left(-75\right)+32-\left(48+32\right)=125+75+32-48-32\)
\(\left(125+75\right)+\left(32-32\right)-48=200-48=152\)
d)\(3.\left(-4\right).2+2.\left(-5\right)-20=-12.2+2.\left(-5\right)-20\)
\(=\left(-12-5\right).2-20=-17.2-20=-140-20=-160\)
Chúc bạn học tốt
17 *75 +25.17-34.25
=17.75+25.17-17.2.25
=17.75+25.17-17.50
=17(75+25-50)
=17.50
=850
17.75+25-34.25
17.(75+25)-34.25
17.100-17.2.25
17.100-17.50
17.(100-50)
17.50
850
1.a) 4.(12+88) = 4.100=400
b)72- 6 .[2.8:8 ]=72-6.[16:8]=72-6 .2= 49-12=37 ( tui ko chắc lắm )
2.a) x=26-11=15
b) (4x-15)3=53
4x-15=5
4x= 5+15
4x=20
vậy x = 20
Bài 2:
a: Ta có: x+11=26
nên x=15
b: Ta có: \(\left(4x-15\right)^3=125\)
\(\Leftrightarrow4x-15=5\)
hay x=5
[ 504 - ( 52 . 8 + 70 ) : 33 + 6 ] : 125
= [ 504 - ( 25 . 8 + 70 ) : 27 + 6 ] : 125
= [ 504 - ( 200 + 70 ) : 27 + 6 ] : 125
= [ 504 - 270 : 27 + 6 ] : 125
= [ 504 - 10 + 6 ] : 125
= 500 : 125
= 4
[ 504 - ( 5 2 . 8 + 70 ) : 3 3 + 6 ] : 125
= [ 504 - 270 : 27 + 6 ] : 125
= [ 504 - 10 + 6 ] : 125
= [ 494 + 6 ] : 125
= 500 : 125
= 4