a. 38,42 + 19,5 + 61,58 + 80,5 = ( 38,42 + 61,58 ) + ( 19,5 + 80,5 )

                                                 = 100 + 100

                                                 = 200

b. 50 x 7,32 x 2 = ( 50 x 2 ) x 7,32 )

                         = 100 x 7,32

                         = 732

c.125,7 x 22 + 125,7 x 78 = 125,7 x ( 22 + 78 )

                                         = 125,7 x 100

                                         = 12570

d, 3,4 x 1,1 + 6,6 x 1,1 = ( 3,4 + 6,6 ) x 1,1

                                    = 10 x 1,1

                                    = 11

a. = (38,42 + 61,85 ) + (19,5 + 80,5 )

= 100,27 + 100

= 200,27

b. = (50 ×2) ×7,32

= 100 × 7,32

= 732

c.= 125,7 × (22 + 78)

= 125,7 × 100

= 12570

d. = 1,1 × (3,4 + 6,6 )

= 1,1 × 10

= 11

Sửa lai câu a

a. = (38,42 + 61,58) + (19,5 + 80,5 )

= 100 + 100 

= 200

cho mk xin lỗi nhé tks

a ) 38,42 + 19,5 + 61,58 + 80,5

= ( 38,42 + 61,58 ) + ( 19,5 + 80,5 )

= 100 + 100

= 200

b) 50 x 7,82 x 2

= ( 50 x 2 ) x 7,82

= 100 x 7,82 

= 782

c) 125,7 x 22 + 125,7 x 78

= 125,7 x ( 22 + 78 )

= 125,7 x 100

= 12570

d) 3,4 x 11 + 6,6 x 11

= ( 3,4 + 6,6 ) x 11

= 10 x 11

= 110

a=200

b=107,82

c=12570

d=11

Tính nhanh:

a) 38,42 + 19,5 + 61,58 + 80,5

= .( 38,42 + 61,58 ) + ( 19,5 + 80,5 )

=  100 + 100..............………………

= ......200.........……………………...

b) 50 x 7,82 x 2

= .50 x 2 x 7,82...........

= 100 x 7,82..............

= .......782........………

c) 125,7 x 22 + 125,7 x 78

= ..125,7 x ( 22 + 78 )

= 125,7 x 100.............…………………………

= .........12570......…………………………

d) 3,4 x 1,1 + 6,6 x 1,1

= ....( 3,4 + 6,6 ) x 1,1

=  10 x 1,1...........…………………………

= .......11........…………………………

ôi bạn ơi khó quá

tính nhanh:

a) 38,42 + 19,5 + 61,58 + 80,5

= ( 38,42 + 61,58 ) + ( 19,5 + 80,5 )

 = 100 + 100 = 200

b) 50 x 7,82 x 2

= ( 50 x 2 ) x 7,82

= 100 x 7,82 = 782

c) 125,7 x 22 + 125,7 x 78

= 125,7 x ( 22 + 78 )

= 125,7 x 100 = 12570

d) 3,4 x 1,1 + 6,6 x 1,1

= ( 3,4 + 6,6 ) x 1,1

= 10 x 1,1 = 11

đã cố gắng tiết kiệm giấy nhưng vẫn đẹp rồi đuấy :)))))))

t*** cho tớ nhé

uk chúng mk là bn mà

Đề đúng: Kết quả phép tính \(\dfrac{2^{12}\times3^5-4^6\times9^2}{\left(2^2\times3\right)^6+8^4\times3^5}-\dfrac{5^{10}\times7^3-25^5\times49^2}{\left(125\times7\right)^3+5^9\times14^3}\) là ...

Giải:

Ta có:

\(\dfrac{2^{12}\times3^5-4^6\times9^2}{\left(2^2\times3\right)^6+8^4\times3^5}-\dfrac{5^{10}\times7^3-25^5\times49^2}{\left(125\times7\right)^3+5^9\times14^3}\) \(=\dfrac{2^{12}\times3^5-\left(2^2\right)^6\times\left(3^2\right)^2}{\left(2^2\right)^6\times3^6+\left(2^3\right)^4\times3^5}-\dfrac{5^{10}\times7^3-\left(5^2\right)^5\times\left(7^2\right)^2}{\left(5^3\times7\right)^3+5^9\times\left(2\times7\right)^3}\) \(=\dfrac{2^{12}\times3^5-2^{12}\times3^4}{2^{12}\times3^6+2^{12}\times3^5}-\dfrac{5^{10}\times7^3-5^{10}\times7^4}{\left(5^3\right)^3\times7^3+5^9\times2^3\times7^3}\) \(=\dfrac{2^{12}\times3^4\times\left(3-1\right)}{2^{12}\times3^5\times\left(3+1\right)}-\dfrac{5^{10}\times7^3\times\left(1-7\right)}{5^9\times7^3+5^9\times2^3\times7^3}\) \(=\dfrac{2^{12}\times3^4\times2}{2^{12}\times3^5\times4}-\dfrac{5^{10}\times7^3\times\left(-6\right)}{5^9\times7^3\times\left(1+2^3\right)}\) \(=\dfrac{2^{13}\times3^4}{2^{12}\times3^5\times2^2}-\dfrac{5^{10}\times7^3\times\left(-6\right)}{5^9\times7^3\times\left(1+8\right)}\) \(=\dfrac{2^{13}\times3^4}{2^{14}\times3^5}-\dfrac{5^{10}\times7^3\times\left(-6\right)}{5^9\times7^3\times9}\) \(=\dfrac{1}{6}-\dfrac{-10}{3}\) \(=\dfrac{7}{2}\)

Vậy kết quả của phép tính đã cho là \(\dfrac{7}{2}\).

\(\dfrac{2^{12}\cdot3^5-4^6\cdot9^2}{\left(2^2\cdot3\right)^6+8^4\cdot3^5}-\dfrac{5^{10}\cdot7^3-25^5\cdot49^2}{\left(125\cdot7\right)^3+5^9\cdot14^3}\)

\(=\dfrac{2^{12}\cdot3^5-\left(2^2\right)^6\cdot\left(3^2\right)^2}{\left(2^2\right)^6\cdot3^6+\left(2^3\right)^4\cdot3^5}-\dfrac{5^{10}\cdot7^3-\left(5^2\right)^5\cdot\left(7^2\right)^2}{\left(5^3\cdot7\right)^3+5^9\cdot\left(2\cdot7\right)^3}\)

\(=\dfrac{2^{12}\cdot3^5-2^{12}\cdot3^4}{2^{12}\cdot3^6+2^{12}\cdot3^5}-\dfrac{5^{10}\cdot7^3-5^{10}\cdot7^4}{5^9\cdot7^3+5^9\cdot2^3\cdot7^3}\)

\(=\dfrac{2^{12}\cdot3^4\left(3-1\right)}{2^{12}\cdot3^5\left(3+1\right)}-\dfrac{5^{10}\cdot7^3\left(1-7\right)}{5^9\cdot7^3\left(1+2^3\right)}\)

\(=\dfrac{2}{3\cdot4}-\dfrac{5\cdot\left(1-7\right)}{1+8}\)\(=\dfrac{1}{3\cdot2}-\dfrac{5\cdot\left(-6\right)}{9}\)

\(=\dfrac{1}{6}-\dfrac{-10}{3}=\dfrac{1}{6}+\dfrac{10}{3}=\dfrac{7}{2}\)

\(\dfrac{7}{2}\)

c.2891,1

d.39,15

18/25=72/100

91/4=2275/100

37/20=185/100

86/125=688/1000

71/8=8875/1000

\(1\frac{8}{25}=\frac{33}{25}=1.32\)

\(9\frac{1}{4}=\frac{37}{4}=9.25\)

\(3\frac{7}{20}=\frac{67}{20}=3.35\)

\(8\frac{6}{125}=\frac{1006}{125}=8.048\)

\(7\frac{1}{8}=\frac{57}{8}=7.125\)

43,6 x 5,9=257,24

0,12x 81=9,72

5,124 x 11,3=50,9012

55,65 : 5=11,13

37,248:5,82=6,4

15,6:0,3=52

Tính nhanh

125,7 x 22 + 125,7 x 77 + 125,77

=125,7x 22 + 125,7 x 77 + 125,77 x1

=125,7x(22+77+1)

=125,7x100

=12570