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a: =>x=5/6-3/4=10/12-9/12=1/12
b: =>x=12-3/5=57/5
c: =>x=3/5+5/7=21/35+25/35=46/35
d: =>x=7/9:3=7/27
e: =>x=7/8x12/5=84/40=21/10
f: =>x=13:5/3=39/5
a, 125 x 1,2 + 1,2 x 874 + 1,2
=125 x 1,2 + 1,2 x 874 + 1,2 x 1
= 1,2 x (125+874+1)
= 1,2 x 1000
= 1200
b, 24,369 x 99+24,369 x (7:4 - 0,75)
= 24,369 x 99 + 24,369 x (1,75-0,75)
= 24,369 x 99 + 24,369 x 1
= 24,369 x (99+1)
= 24,369 x 100
= 2436,9
\(a,125\times1,2+1,2\times874+1,2\\ =\left(125+874+1\right)\times1,2\\ =1000\times1,2\\ =1200\\ b,24,369\times99+24,369\times\left(7:4-0,75\right)\\ =24,369\times99+24,369\times\left(1,75-0,75\right)\\ =24,369\times99+24,369\times1\\ =24,369\times\left(99+1\right)\\ =24,369\times100\\ =2436,9\)
1.
=3/5x(3/7+4/7)+2/5x(13/9-4/9)
=3/5x1+2/5x1
=3/5+2/5
=1
2.Xx(3/4+4/5)=7/10
Xx31/20=7/10
X =7/10:31/20
X =14/31
\(\frac{3}{5}\cdot\frac{3}{7}+\frac{3}{5}\cdot\frac{4}{7}+\frac{2}{5}\cdot\frac{13}{9}-\frac{2}{5}\cdot\frac{4}{9}\)
\(=\frac{3}{5}\cdot\left(\frac{3}{7}+\frac{4}{7}\right)+\frac{2}{5}\cdot\left(\frac{13}{9}-\frac{4}{9}\right)\)
\(=\frac{3}{5}\cdot1+\frac{2}{5}\cdot1\)\(=\frac{3}{5}+\frac{2}{5}=1\)
_________________________________________
\(\frac{3}{4}\cdot x+\frac{4}{5}\cdot x=\frac{7}{10}\)
\(\left(\frac{3}{4}+\frac{4}{5}\right)\cdot x=\frac{7}{10}\)
\(\frac{31}{20}\cdot x=\frac{7}{10}\)
\(x=\frac{7}{10}:\frac{31}{20}\)
\(x=\frac{14}{31}\)
a/7/9(1/4+3/4)=7/9.1=7/9
b/13/9(16/5-14/5+3/5)=13/9.1=13/9
34cm=34/100m
524mm=524/1000m
70mm=70/1000=7/100m
a/7/9(1/4+3/4)=7/9.1=7/9
b/13/9(16/5-14/5+3/5)=13/9.1=13/9
34cm=34/100m
524mm=524/1000m
70mm=70/1000=7/100m
13/15-(y.4/15-2/9).3/5=1/5
(y.4/15-2/9).3/5=13/15-1/5
(y.4/15-2/9).3/5=2/3
y.4/15-2/9=2/3:3/5
y.4/15-2/9=10/9
y.4/15=10/9+2/9
y.4/15=4/3
y=4/3:4/15
y=5
Những chỗ có dấu "." thì thay bằng dấu nhân
a, ( 4,578 x 3 +5,422 x 3 ) : 1,2 -1,2
= [ 3 x ( 4,578 +5,422 ) ] : 1,2 -1,2
= ( 3 x 10 ) : 1,2 -1,2
= 30 : 1,2 -1,2
= 25 -1,2
= 23,8
b, \(\frac{3}{5}\)x\(\frac{9}{7}\)-\(\frac{3}{5}\)x\(\frac{3}{14}\)
= \(\frac{3}{5}\)x ( \(\frac{9}{7}\)- \(\frac{3}{14}\))
= \(\frac{3}{5}\)x\(\frac{15}{14}\)
= \(\frac{9}{14}\)
Chúc bạn học tốt
(4,578 x 3 + 5,422 x 3 ) : 1,2 - 1,2
=( 3 x [4,578 + 5,422 ] : 1,2 - 1,2
=(3 x 10) : 1,2 - 1,2
=30 : 1,2 - 1,2
=25-1.2
=23.8