Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
80*33+97*33+34*97+33*17
=33*(80+97+17)+34*97
=33*194+34*97
=33*97*2+34*97
=97*(33*2+34)
=97*100
=9700
tik mik nha bn
4,86 x 0,25 x 40
= 4,86 x ( 0,25 x 40 )
= 4,86 x 10
= 48,6
72,9 x 99 + 72 +0,9
= 72,9 x 99 + ( 72 + 0,9 ) x 1
= 72,9 x 99 + 72,9 x 1
= 72 ,9 x ( 99 + 1 )
= 72,9 x 100
= 7200
0,125 x 6,94 x 80
=(0,125 x 80 ) x 6,94
= 10 x 6,94
= 69,4
X + 100 x 10 + 100 x 10 = 30
X +1000 + 1000 = 30
X + 2000 = 30
X = 30 - 2000
X = -1970
\(x+100\cdot10+100\cdot10=30\)
\(x+1000+1000=30\)
\(x+2000=30\)
\(x=30-2000\)
\(x=1970\)
\(52:x=\frac{1}{4}+\frac{1}{28}+\frac{1}{70}+\frac{1}{130}\)
\(52:x=\frac{1}{1\times4}+\frac{1}{4\times7}+\frac{1}{7\times10}+\frac{1}{10\times13}\)
\(52:x=\frac{1}{3}\times\left(\frac{3}{1\times4}+\frac{3}{4\times7}+\frac{3}{7\times10}+\frac{3}{10\times13}\right)\)
\(52:x=\frac{1}{3}\times\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}\right)\)
\(52:x=\frac{1}{3}\times\left(1-\frac{1}{13}\right)\)
\(52:x=\frac{1}{3}\times\frac{12}{13}\)
\(52:x=\frac{4}{13}\)
\(x=52:\frac{4}{13}\)
\(x=169\)
52 :x =1/4 + 1/28 +1/70 + 1/130
52 : x = 4/13
x = 52 : 4/13
x = 169
a. x * (135 + 865 ) = 85000
x * 1000 = 85000
x=85000 : 1000
x=85
b.1754 + ( x : 35 ) = 6416
x : 35 = 6416 - 1754
x : 3 5 = 4662
x = 4662 *35
x = 163170
29 - ( 209/10 * x - 80 ) : 2010/29 = 0
( 209/10 * x - 80 ) : 2010/29 = 29 - 0
( 209/10 * x - 80 ) : 2010/29 = 29
( 20,9 * x -80 ) = 29 * 2010/ 29
( 20,9 * x -80 ) = 2010
20,9 * x = 2010 + 80
20,9 * x = 2090
x = 2090 : 20,9
x = 100
HOK TỐT
29 - (\(\frac{209}{10}\)*X - 80 ) : \(\frac{2010}{29}\)=0
giải
(\(\frac{209}{10}\)* X - 80 ) : \(\frac{2010}{29}\)= 29
\(\frac{209}{10}\)* X - 80 )=29 x \(\frac{2010}{29}\)
\(\frac{209}{10}\)* X - 80 = 2010
\(\frac{209}{10}\)* X = 2010 + 80
\(\frac{209}{10}\)* X= 2090
X= 2090 : \(\frac{209}{10}\)
X= 2090 * \(\frac{10}{209}\)
X=100
\(\Leftrightarrow Xx80=50x80\)
\(\Leftrightarrow X=50\)
#quankun^^
\(78.x+x+x=80.50\)
\(78x+2x=4000\)
\(80x=4000\)
\(x=50\)