21 x 56 - x = 1000
ai nhanh mk tick cho. >3 >3 >3
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Diện tích hình vuông là :
5 x 5 = 25 ( cm2 )
Đáp số :..................cm2
5656 x 562 = 5658
........................................
100012 x 10002 = 100014
..........................
AI K MK LÊN 60 ĐIỂM 3 K MỖI NGÀY
x) \(\frac{-3}{7}.x-\left(\frac{1}{21}.x-\frac{-4}{9}\right)=\frac{2}{8}\)
\(\frac{-3}{7}.x-\frac{1}{21}.x-\frac{4}{9}=\frac{1}{4}\)
\(x.\left(\frac{-3}{7}-\frac{1}{21}\right)-\frac{4}{9}=\frac{1}{4}\)
\(x.\frac{\left(-10\right)}{21}-\frac{4}{9}=\frac{1}{4}\)
\(x.\frac{\left(-10\right)}{21}=\frac{1}{4}+\frac{4}{9}\)
\(x.\frac{\left(-10\right)}{21}=\frac{25}{36}\)
\(x=\frac{25}{36}:\left(\frac{-10}{21}\right)\)
\(x=\frac{-35}{24}\)
Chúc bn học tốt !!!
(x/-5+2/3);11/5-1,4.15/49=|-5|/21
(x/-5+2/3);11/5-1,4.15/49=5/21
(x/-5+2/3);11/5-21/49=5/21
(x/-5+2/3);11/5=5/21+21/49
(x/-5+2/3);11/5=35/147+63/147
(x/-5+2/3);11/5=35+63/147
(x/-5+2/3);11/5=98/147
x/-5+2/3=98/147.11/5
x/-5+2/3=98.11/147.5
x/-5+2/3=1078/735
x/-5+2/3=154/105
x/-5=154/105-2/3
x/-5=154/105-70/105
x/-5=154-70/105
x/-5=84/105
x/-5=-4/-5
suy ra x=-4
b,21/17x13/14x56x3/42
=21/17x3/42x56x13/14
=21x3/17x42 x 56x13/14
=21x3/17x21x2 x 14x4x13/14
=3/17x2 x 4x13
=3/24 x 52=3x52/24
=3x52/3x8
=52/8=13/2
a, 6/7 x 16/15 x 7/6 x 21/32
=(6/7 x 7/6)x16/15x21/32
=16/15x21/32
=16x21/15x32
=16x3x7/3x5x16x2
=7/5x2=7/10
sakura
Tính nhanh:
a) 56 x 44 + 56 x 11 + 56 x 45
= 56 x ( 44 + 11 + 45 )
= 56 x 100
= 5600
b) 8 x 3 + 8 x 6 + 8
= 8 x ( 3 + 6 + 1 )
= 8 x 10
= 80
^^ Học tốt!!!
\(\frac{2}{15}\cdot\frac{3}{x}=-\frac{70}{21}\)
\(\frac{3}{x}=-\frac{70}{21}:\frac{2}{15}\)
\(\frac{3}{x}=-25\)
\(x=3:\left(-25\right)=-\frac{3}{25}\)
\(\frac{3}{x}=\frac{-70}{21}\div\frac{2}{15}\)
\(\frac{3}{x}=-25\)
\(\Rightarrow x=\frac{-3}{25}\)
\(a,\frac{62}{7}:x=\frac{29}{9}:\frac{3}{56}\)
\(\frac{62}{7}:x=\frac{1624}{27}\)
\(x=\frac{62}{7}:\frac{1624}{27}=\frac{837}{5684}\)
\(b,\frac{1}{5}:x=\frac{1}{5}-\frac{1}{7}\)
\(\frac{1}{5}:x=\frac{2}{35}\)
\(x=\frac{1}{5}:\frac{2}{35}=\frac{7}{2}\)
\(c,\frac{2}{3}.x-\frac{4}{7}=\frac{1}{7}\)
\(\frac{2}{3}.x=\frac{1}{7}+\frac{4}{7}=\frac{5}{7}\)
\(x=\frac{5}{7}:\frac{2}{3}=\frac{15}{14}\)
\(d,\frac{2}{7}-\frac{8}{9}.x=\frac{2}{3}\)
\(\frac{8}{9}.x=\frac{2}{7}-\frac{2}{3}=-\frac{8}{21}\)
\(x=-\frac{8}{21}:\frac{8}{9}=-\frac{3}{7}\)
\(e,\frac{4}{7}+\frac{5}{9}:x=\frac{1}{5}\)
\(\frac{5}{9}:x=\frac{1}{5}-\frac{4}{7}=-\frac{13}{35}\)
\(x=\frac{5}{9}:-\frac{13}{35}=\frac{175}{117}\)
\(i,\frac{2}{5}-\frac{2}{5}.x=\frac{2}{5}\)
\(\frac{2}{5}.\left(1-x\right)=\frac{2}{5}\)
\(1-x=\frac{2}{5}:\frac{2}{5}=1\)
\(x=1-1=0\)
\(g,\frac{2}{3}+\frac{1}{3}:x=-1\)
\(\frac{1}{3}:x=-1-\frac{2}{3}=-\frac{5}{3}\)
\(x=\frac{1}{3}:-\frac{5}{3}=-\frac{1}{5}\)
học tốt nha
5x2+3x3=19
Mình nhanh nhất nhè, khoanh cho mình nhé, mình kb nhé
21 x 56 - x = 1000
1176 - x = 1000
x = 1176 - 1000
x = 176
tk mk nha
1176-176=1000
vậy x là 176