a)5×25×2×8×4×125

=(5×2)×(25×4)×(8×125)

=10×100×1000

=1000000

b)3×5^2

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

a: Ta có: \(A=\sqrt{8}-2\sqrt{18}+3\sqrt{50}\)

\(=2\sqrt{2}-6\sqrt{2}+15\sqrt{2}\)

\(=11\sqrt{2}\)

b: Ta có: \(B=\sqrt{125}-10\sqrt{\dfrac{1}{20}}+\dfrac{5-\sqrt{5}}{\sqrt{5}}\)

\(=5\sqrt{5}-\sqrt{5}+\sqrt{5}-1\)

\(=5\sqrt{5}-1\)

a) \(=\left(\left(-\frac{1}{4}-\frac{5}{3}\right)+\frac{7}{33}\right)-\left(-\frac{15}{12}+\frac{6}{11}-\frac{48}{49}\right)\)

\(=\left(-\frac{23}{12}+\frac{7}{33}\right)+\frac{15}{12}-\frac{6}{11}+\frac{48}{49}\)

\(=\left(-\frac{23}{12}+\frac{15}{12}\right)+\left(\frac{9}{33}-\frac{6}{11}\right)+\frac{48}{49}\)

\(=-\frac{2}{3}-\frac{3}{11}+\frac{48}{49}\)

\(=\frac{65}{1617}\)

b) \(=\frac{11}{125}+\left(-\frac{17}{18}+\frac{4}{9}\right)+\left(-\frac{5}{7}+\frac{17}{14}\right)\)

\(=\frac{11}{125}-\frac{1}{2}+\frac{1}{2}\)

\(=\frac{11}{125}\)

tính từng cái là đc

a) 12 : { 400 : [ 500 - ( 125 + 25 . 7 )]}

= 12 : { 400 : [ 500 - ( 125 + 175 )]}

= 12 : { 400 : [ 500 - 300 ]}

= 12 : { 400 : 200 }

= 12 : 2 

= 6

b) 5 . 22 - 18 : 3

= 110 - 6

= 104

c) 18 : 3 + 182 + 3 . ( 51 : 17 )

= 6 + 182 + 3.3

= 6 + 182 + 9

= 197

d) 25.8 - 12.5 + 170 : 17 - 8

= 1000 - 60 + 10 - 8

= 940 + 10 - 8

= 940 + 2

= 942

a. -(-129) + 315 + (-129) - 215

= 129 + (-129) + (315 - 215)

= 0 + 100

= 100

b. (-25).(-38).8.(-125).(-4)

= [ (-25).(-4) ] . [ (-125).8 ] . (-38)

= 100 . (-1000) . (-38)

= 3800000

c. 12.(35 + 18) - 18.(12 - 35)

= 12.35 + 12.18 - 18.12 + 18.35

= 12.35 + 18.35 + 12.18 - 18.12

= 35 . (12 + 18) + 0

= 35 . 30

= 1050

bài ày khó 97%

a: =125-24-75

=50-24

=26

Bài 2: 

a: \(\left(6x-39\right):7=3\)

\(\Leftrightarrow6x-39=21\)

hay x=10

a, mk làm kết quả lun.

=12:{400:[500-(125+175)]}

=12:{400:[500-300]}

=12:{400:200}

=12:2

=6

b,

=110-18:3

= 110-6

=104

k mk nha. k xong mk làm tiếp. dài quá nhưng cx dễ