373,6983051

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= 373,6983051

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373,6983051

Câu 1

a)(-9)+(-3) = -9 - 3 = -12

b)6.7.5²+42.75 = 42. 25 + 42. 75 = 42(25 + 75) = 42. 100 = 4200

c)4529-(186+4529) = 4529 - 186 - 4529 = -186

Câu 2

a)x-7=15

<=> x = 15 + 7

<=> x = 22

b)9+4.(x-5)=17

<=> 9 + 4x - 20 = 17

<=> 4x = 28

<=> x = 7

c)(x-3)³=27

<=> (x - 3)³ = 3³

=> x - 3 = 3

<=> x = 6

Câu 1: 

a) Ta có: (-9)+(-3)

=-(9+3)

=-12

b) Ta có: \(6\cdot7\cdot5^2+42\cdot75\)

\(=6\cdot7\cdot5^2+6\cdot7\cdot5^2\cdot3\)

\(=6\cdot7\cdot5^2\cdot\left(1+3\right)\)

\(=6\cdot7\cdot25\cdot4\)

\(=42\cdot100=4200\)

c) Ta có: 4529-(186+4529)

=4529-186-4529

=-186

Câu 2: 

a) Ta có: x-7=15

\(\Leftrightarrow x=15+7\)

hay x=22

Vậy: x=22

b) Ta có: \(9+4\left(x-5\right)=17\)

\(\Leftrightarrow9+4x-20=17\)

\(\Leftrightarrow4x-11=17\)

\(\Leftrightarrow4x=28\)

hay x=7

Vậy: x=7

c) Ta có: \(\left(x-3\right)^3=27\)

\(\Leftrightarrow\left(x-3\right)^3=3^3\)

\(\Leftrightarrow x-3=3\)

hay x=6

Vậy: x=6

\(a,123\times54+27\times123-12\times123+123\times31\)

\(=123\times\left(54+27-12+31\right)\)

\(=123\times100\)

\(=12300\)

\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)

\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)

\(22< n< 24\)

Vì \(23>22\) và \(23< 24\) nên \(n=23\)

a, 123x(54+27-12+31)

=123x100

=12300

a123x54+27x123-12x123+123x31

=123:54+27:123-12:123+123:31

=6642+27:123-12:123+123:31

=6642+3321-12:123+123:31

=6642+3321-1476+123:31

=6642+3321-1476+3813

=12300

b,121/27x54/11<n>100/21:25/126

=22<n>24

n=23

Bài làm

   123 + [ 54 + ( -123 ) + 46 ]

= 123 + [ 54 - 123 + 46 ]

= 123 - 23

= 100

# Học tốt #

123 + [ 54 + ( - 123 ) + 46 ]

= 123 + [ - 69 + 46 ]

= 123 + ( - 23 )

= 100

123 + [54 + (-123) + 46]

= 123 + (54 - 123 + 46)

= 123 + (-23)

= 123 - 23

= 100

\(a,=\left(123-123\right)+\left(54+46\right)=100\\ b,=\left(-64+64\right)+\left(71-111\right)=-40\)

a: =54+46=100

tính nhanh

a,123+54+(-123)+46=(123-123)+(54+46)=100       

b,(-64)+(-111)+64+71=((-64)+64)+(71-111)=-40

123 x 54 + 123 x 46

= 123 x (54 +46) = 123 x 100

= 12300