Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
40025 - 25000 : ( 125 x 8 )
40025 - 25000 : 1000
40025 - 25
= 40000
đúng 100%
mình giải đầy đủ nhất đấy
a)=(3/4+3/12)+2/5
=1+2/15
=17/15
b)
(40/17-6/17)+(47/15-4/30)
=2+3=5
k cho minh
Tinh1 bằng cách thuận tiện nhất :
a ) 3/4 + 2/5 + 3/12
= 3/4 + 2/5 + 1/4
= ( 3/4 + 1/4 ) + 2/5
= 1 + 2/5
= 2/5
b ) 47/15 + 40/17 - 4/30 - 6/17
= 47/15 + 40/17 - 2/15 - 6/17
= ( 47/15 - 2/15 ) + ( 40/17 - 6/17 )
= 45/15 + 34 /17
= 3 + 2
= 5
tk mk nha
thấy thế nào , comment đi
yêu mọi người nhiều lắm !!!
a) 4/5 x ( 5/4 - 5/7 )
= 4/5 x 15/28
= 21
b) 5/8 x 9/7 + 5/8 x 5/7
= 5/8 x ( 9/7 + 5/7 )
= 5/8 x 2
= 5/4
a, 4/5 x ( 5/4 - 5/7)
=(4/5 x 5/4)- (4/5-5/7)
=1-4/7
=3/7
b, 5/8 x 9/7 -5/8 x 5/7
=5/8 x (9/7 - 5/7 )
=5/8 x 4/7
=5/14
\(\frac{9}{10}+\frac{7}{9}+\frac{5}{8}+\frac{3}{7}+\frac{3}{5}+\frac{2}{5}+\frac{4}{7}+\frac{3}{8}+\frac{2}{9}+\frac{1}{10}\)\(\frac{1}{10}\)
= ( 9/10 + 1/10 ) + ( 7/9 + 2/9 ) + ( 5/8 + 3/8 ) + ( 3/7 + 4/7 ) + ( 3/5 + 2/5 )
= 1 + 1 + 1 + 1 + 1
= 1 x 5
= 5
\(\left(\frac{9}{10}+\frac{1}{10}\right)+\left(\frac{7}{9}+\frac{2}{9}\right)+\left(\frac{5}{8}+\frac{3}{8}\right)+\left(\frac{3}{7}+\frac{4}{7}\right)+\left(\frac{3}{5}+\frac{2}{5}\right)\)2/5)
=1+1+1+1+1=5
.
\(\dfrac{4}{5}\times\left(\dfrac{5}{4}-\dfrac{5}{7}\right)\)
\(=\dfrac{4}{5}\times\left(\dfrac{35}{28}-\dfrac{20}{28}\right)\)
\(=\dfrac{4}{5}\times\dfrac{15}{28}\)
\(=\dfrac{3}{7}\)
__
\(\dfrac{5}{8}\times\dfrac{9}{7}+\dfrac{5}{8}\times\dfrac{5}{7}\)
\(=\dfrac{5}{8}\times\left(\dfrac{9}{7}+\dfrac{5}{7}\right)\)
\(=\dfrac{5}{8}\times2=\dfrac{10}{8}=\dfrac{5}{4}\)
a; 60 \(\times\) (\(\dfrac{7}{12}\) + \(\dfrac{4}{15}\))
= 60 \(\times\) \(\dfrac{7}{12}\) + 60 \(\times\) \(\dfrac{4}{15}\)
= 35 + 16
= 51
a,\(60\times\left(\frac{7}{12}+\frac{4}{15}\right)\)\(=\frac{60\times7}{12}+\frac{60\times4}{15}\)
\(=\frac{12\times5\times7}{12}+\frac{15\times4\times4}{15}\)
\(=5\times7+4\times4\)
\(=35+16\)
\(=51\)
b, \(\frac{1}{2}\times\frac{2}{3}\times\frac{3}{4}\times...\times\frac{8}{9}\)\(=\frac{1\times2\times3\times4\times5\times6\times7\times8}{2\times3\times4\times5\times6\times7\times8\times9}\)
\(=\frac{1}{9}\)
a)C1:=2/7:2/5
=5/7
C2:=6/7:2/5-4/7:2/5
=15/7-10/7
=5/7
b)C1:=88/30+77/30
=11/2
C2:=(8/15+7/15):2/11
=1:2/11
=11/2
96 * 37 - 3 * 26 * 32 - 96
= 96 * 37 - 96 * 26 - 96 * 1
= 96 * ( 37 - 26 - 1 - 1 )
= 96 * 10
= 960
=
96 x 37 - 3 x 26 x 32 - 96
= 3552- 3 x 26 x 32 - 96
= 3552 - 78 x 32 -96
= 3552 - 2496 -96
= 1056 - 96
= 960
ủng hộ nhé
ai k mình mình k lại
789* 101 - 789
= 789 * (101 - 1 )
= 789 * 100
= 78900
789*101-789
=789*(101-1)
=789*100
=78900