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23 tháng 8 2016

a) 6,3 + (-3,7) + 2,4 + (-0,3)

= (6,3 + 2,4) + [-3,7 + (-0,3)]

= 8,7 + (-4)

=  4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5)

= (-4,9 + 4,9) + [5,5 + (-5,5)]

= 0 + 0

= 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2

= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7

= 0 + 0 + 3,7

= 3,7

d) (-6,5) . 2,8 + 2,8 . (-3,5)

= 2,8 . [-6,5 + (-3,5)]

= 2,8 . (-10)

= -28.

5 tháng 9 2016

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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">

20 tháng 6 2017

a, \(6,3+\left(-3,7\right)+2,4+\left(-0,3\right)\)

\(=\left(6,3-0,3\right)+\left(-3,7+2,4\right)\)

\(=6-1,3=4,7\)

b, \(\left(-4,9\right)+5,5+4,9+\left(-5,5\right)\)

\(=\left(-4,9+4,9\right)+\left(5,5-5,5\right)\)

\(=0+0=0\)

Chúc bạn học tốt!!!

20 tháng 6 2017

a, 6.3+(-3.7)+2.4+(-0.3) = (6,3 - 0,3) + (-3,7+2,4) = 6 - 1,3 = 4,7

b, (-4.9)+5.5+4.9+(-5.5) = (-4,9 +4,9) + (-5,5 + 5,5) = 0 + 0 = 0

20 tháng 8 2019

làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người

20 tháng 8 2019

nhanh nha mọi người

T.T

25 tháng 5 2020

Đáp án 2^

25 tháng 5 2020

Bài làm

1. Rút gọn

 \(\frac{2^5.7+2^6}{2^5.5^2-2^5.7}=\frac{2^5\left(7+2\right)}{2^5\left(25-7\right)}=\frac{9}{18}=\frac{1}{2}\)

2. So sánh

Ta có: \(\frac{2.7+6.21+9.28}{4.9+8.27+12.36}\)

\(=\frac{14+126+252}{36+216+432}=\frac{392}{684}=\frac{98}{171}\)

Mà ta thấy, mẫu số của phân số 98/171 lớn hơn mẫu số của phân sốc 49/84 ( 171 > 84 )

=> \(\frac{98}{171}< \frac{49}{84}\)

Vậy \(\frac{2.7+6.21+9.28}{4.9+8.27+12.36}< \frac{49}{84}\)

3. Tìm x

a) ( 2x + 14 ) : 22 - 3 = 1

( 2x + 14 ) : 4 - 3 = 1

( 2x + 14 ) : 4 = 1 + 4

( 2x + 14 ) : 4 = 5

2x + 14 = 5 x 4

2x + 14 = 20

2x = 6

x = 3

Vậy x = 3

b) 32x - 5 + 2 = 29

9x - 5 + 2 = 29

9x - 5 = 27

9x = 32

x = 32 : 9 = \(\frac{32}{9}\)

Vậy x = \(\frac{32}{9}\)

17 tháng 2 2017

\(A=1,7+\left|3,4-x\right|\)

\(C\text{ó};\left|3,4-x\right|\)lớn hơn or =0

\(\Rightarrow\)\(1,7+\left|3,4-x\right|=1,7+0\)

\(\Rightarrow1,7+\left|3,4-x\right|=1,7\)

\(\Rightarrow\left|3,4-x\right|=0\)

\(\Rightarrow x=3,4\)

\(B=\left|x+2,8\right|-3,5\)

\(C\text{ó}:\left|x+2,8\right|\)Lớn hơn or = 0

\(\Rightarrow\left|x+2,8\right|-3,5=0-3,5\)

\(\Rightarrow\left|x+2,8\right|-3,5=-3,5\)

\(\Rightarrow\left|x+2,8\right|=0\)

\(\Rightarrow x=-2,8\)

\(C=\left|4,3-x\right|+3,7\)

\(C\text{ó}:\left|4,3-x\right|\) Lớn hơn or = 0

\(\Rightarrow\left|4,3-x\right|+3,7=0+3,7\)

\(\Rightarrow\left|4,3-x\right|+3,7=3,7\)

\(\Rightarrow\left|4,3-x\right|=0\)

\(\Rightarrow x=4,3\)

a) \(16^{^3}:8^2=\left(8.2\right)^3:8^2=8^3.2^3:8^2=\left(8^3:8^2\right).2^3=8.8=64\)

b)\(8^3.\left(0,125\right)^3=\left(8.0,125\right)^3=1^3=1\)

c)\(7^{^{200}}.\left(\frac{1}{7}\right)^{200}=\left(7.\frac{1}{7}\right)^{200}=1^{200}=1\)

d)\(4.\left(0,25\right)^3.64=4.\left(0,25\right)^3.4^3=4.\left(0,25.4\right)^3=4.1=4\)

e)....

cậu có thể tham khảo bài làm trên đây ạ, chúc cậu hok tốt ^^

4 tháng 8 2016

1.2+2.9+3.7+7.7=2.(1+9)+7.(3+7)

                          =2.10+7.10

                          =(2+7).10

                          =9.10

                          =90

1.2+2.9+3.7+7.7

=2+18+21+49

=20+21+49

=41+49

=90