a) 9 x 24 x 25

=216x25

=5400

b) 12 x 125 x 54

=1500x54

=81000

c) 64 x 125 x 875

=8000x875

=7000000

d) 425 x 7

a) 9 x 24 x 25

b) 12 x 125 x 54

c) 64 x 125 x 875

d) 425 x 7 x4 - 170 x 60

=2975x4 - 170 x 60

=11900- 170 x 60

=11900-10200

=1700

e) 8 x 9 x 14 + 6 x 7 x 12 + 19 x 4 x 18

=1008+504+1368

=2880

Trả lời

a) 9 . 24 . 25 = 9 . 600 = 5400

b) 12 . 125 . 54 = 1500 . 54 = 81000

c) 64 . 125 . 875 = 8000 . 875 = 7000000

d) 425 . 7 . 4 - 170 . 60 = 11900 - 10200 = 1700

e) 8 . 9 . 14 . 6 . 17 . 12 . 19 . 4 . 18 = 

a) 5400

b) 81000

c) 7000000

d) 1700

e) 15684492672

^.^

a) 9 . 24 . 25 = 3.3.3.4.2.25 = (25.4).(3.3.3.2) = 100.54 = 5 400
b) 12 . 125 . 54 = 4.3.125.2.3.3.3 = (125.2.4).(3.3.3.3) = 1000.81 = 81 000
c) 64 . 125 . 875 = (125.64).875 = 8000.875 = 7 000 000
d) 425 . 7 . 4 – 170 . 60 = 25.17.7.4 - 2.5.17.4.3.5 = 25.17.7.4 - 25.17.6.4 = 25.17.4.(7-6) = (25.4).17 = 100.17 = 1 700 

Đề bài câu e sai rồi bn, như này mới đúng:

e) 8 . 9 . 14 + 6 . 17 . 12 + 19 . 4 . 18 = (2.2.2.3.3).2.7 + (2.3.2.2.3).17 + (2.2.2.3.3).19 = 72.14 + 72.17 + 72.19 = 72.(14+17+19)

= 72.50 = 36.2.50 = 36.100 = 3 600
 

a = 5400 

b = 81000

c = 7 000 000 

d = 108800 

e = 3600 nhé bạn 

k cho mình nha , cảm ơn nhiều

a,9 x 24 x 25= 5.400

b,12 x125 x54= 81.000

c,64 x 125 x 875 =7.000.000

d,425 x 7 x 4 - 170 x 60=1.700

e,8 x 9 x 14 + 6 x 17 x 12 +19 x 4 x18=3.600

d. 54-54+67-37+10
=40

e. 326+174-43-57
=400

f. 351+149-875-125
=-500

4(x-3)²-320 = 0

=> 4(x-3)² = 320

=> (x-3)² = 320 : 4 = 80 = (8,94427191)² = (-8,94427191)²

TH1:

x - 3 = 8,94427191

=> x = 11,94427191

TH2: 

x - 3 = -8,94427191

=> x = -5,94427191

7(4+x)³-875 = 0

=> 7(4+x)³ = 875

=> (4+x)³ = 875:7 = 125 = 5³

=> 4 + x = 5

=> x = 1

650 - 5(x+4)² = 330

5(x+4)² = 650 - 330 =320

=> (x+4)² = 320 : 5 = 64 = 8²

=> x+4 = 8

=> x = 4

3(5-x)²-15 = 60

=> 3(5-x)² = 75

=> (5-x)² = 25 = 5² =(-5)²

TH1:

5-x =5

=> x = 0

TH2: 5-x = -5

=> x = 10

5^x . 5^{x + 1} . 7 = 875

\(\Rightarrow\) 5^{2x + 1} = 875 : 7 = 125

\(\Rightarrow\) 5^{2x + 1} = 5³

\(\Rightarrow\) 2x + 1 = 3

\(\Rightarrow\) 2x = 2

\(\Rightarrow\) x = 1

5 + 3^{x + 1} = 86

\(\Rightarrow\) 3^{x + 1} = 81

\(\Rightarrow\) 3^{x + 1} = (\(\pm\)3)⁴

\(\Rightarrow\) x + 1 = \(\pm\)3

\(\Rightarrow\) x = 2, -4

2^x + 2^{x + 1} = 96

\(\Rightarrow\) 2^x + 2^x . 2 = 96

\(\Rightarrow\) 2^x . 3 = 96

\(\Rightarrow\) 2^x = 32

\(\Rightarrow\) 2^x = 2⁵

\(\Rightarrow\) x = 5

Bài 1:

a) 43+45+47+...+565 [có (565-43)/2+1= 262 số hạng)

= [(565+43)*262]/2

= 79648

b) 21+24+27+...+318 [có (318-21)/3+1= 100 số hạng]

= [(318+21)*100]/2

= 16950

Easy busy lemon squeezi

Bài 1 \(875+34+34-2:0+3=875+34+34-0+3\)

                                                                  \(=946\)

Bài 2 \(7+5+4739.0=7+5\)

                                            \(=12\)

bài 1 : 875 + 34 + 34 - 2 : 0 + 3 = 875 + 34 + 34 - 0 + 3

= 946

bài 2 : 7 + 5 + 4739 x 0

= 12 + 0

= 12

hok tốt ^^

a)\(x=875-\left(50\times7\right)=875-350=525\)

b)\(x=504:14=36\)

a,525

b,36

c,69

d,14620

c)\(x=5760:96=60\)

d)\(x=860\times17=14620\)