\(\dfrac{-3}{2}\times\dfrac{-15}{64}+\left(0,8-2\dfrac{4}{5}\right):3\dfrac{2}{3}\\ =\dfrac{45}{128}+\left(-2\right)\times\dfrac{3}{11}\\ =\dfrac{45}{128}-\dfrac{6}{11}\\ =-\dfrac{273}{1408}\)

(x - 2/7)(x + 1/4) > 0

Xét 2 trường hợp:

                                                 Vậy x > 2/7 hoặc x < -1/4

ai nhanh mình tick nha!!!!!!!!

 8888 x 85 + 8888 x 10 + 8888 x 6 – 8888 

= 8888 x ( 85 + 10 + 6 - 1 )

= 8888 x 100

= 888800

=8888 x (85+10+6-1)

=8888 x 100

=888800

\(x+2x+3x+...+100x=2200\)

=>\(x\left(1+2+3+...+100\right)=2200\)

=>\(x.\frac{100.101}{2}=2200\)

=>\(x.5050=2200\)

=>x=2200:5050

=>x=\(\frac{44}{101}\)

\(x+2x+3x+...+100x=220\)

\(\Rightarrow x\left(1+2+3+....+100\right)=2200\)

\(\Rightarrow5050x=2200\)

\(\Rightarrow x=\frac{44}{101}\)

\(x+2x+3x+...+100x=2200\)

\(\Rightarrow x\left(1+2+3+...+100\right)=2200\)

\(\Rightarrow x.5050=2200\)

\(\Rightarrow x=\frac{2200}{5050}=\frac{44}{101}\)

Vậy \(x=\frac{44}{101}\)

a) |2x-3|+x=21

|2x-3|=21-x

\(\Rightarrow\)\(\orbr{\begin{cases}2x-3=21-x\\2x-3=-\left(21-x\right)\end{cases}}\)

TH1: 2x-3=21-x

2x-x=21+3

x=24

TH2: 2x-3=-(21-x)

2x-3 = -21+x

2x-x=-21+3

x=-18

Vậy x \(\varepsilon\){-18;24}

Lời giải:
$45-3(7+x)=6$

$3(7+x)=45-6=39$

$7+x=39:3=13$

$x=13-7=6$

15/19

15/19

đáp án 1

137/10ha = ….m²

Đáp án 137 000 m²

HT

137/10ha = 137/100000 m²

k chắc đâu nhé:))

Cảm ơn các bạn nhìu nhé:)))

a) (-4,625) : (-1,25)   

\(\Leftrightarrow-\dfrac{37}{8}:-\dfrac{5}{4}=-\dfrac{37}{8}.-\dfrac{4}{5}=\dfrac{37}{10}=3,7\)

b) 2,72 x (-3,25)

câu b câu c em làm ra giấy nhe  câu c = 11,5 - 0,325=11,175