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X=(1800+600):30):560:(315:35)
X=(2400:30):560:9
X=80:560:9
X=80x1/560x1/9
X=1/7x1/9
X=1/63
A=58x72+63x81-58x52-63x61
= (58x72-58x52)+(63x81-63x61)
= 58(72-52)+63(81-61)
= 58x20+63x20
= 1160+1260
= 2420
a)\(\frac{8}{3}\)
b)\(\frac{1}{5}=0,2\)
c)\(\frac{17}{135}\)
d)\(\frac{2}{3}\)
e)\(\frac{5}{2}=2,5\)
Bài 2:
a, \(\dfrac{5}{23}\) \(\times\) \(\dfrac{17}{26}\) + \(\dfrac{5}{23}\) \(\times\) \(\dfrac{9}{26}\)
= \(\dfrac{5}{23}\) \(\times\) ( \(\dfrac{17}{26}\) + \(\dfrac{9}{26}\))
= \(\dfrac{5}{23}\) \(\times\) \(\dfrac{26}{26}\)
= \(\dfrac{5}{23}\)
b, \(\dfrac{3}{4}\) \(\times\) \(\dfrac{7}{9}\) + \(\dfrac{7}{4}\) \(\times\) \(\dfrac{3}{9}\)
= \(\dfrac{7}{12}\) + \(\dfrac{7}{12}\)
= \(\dfrac{14}{12}\)
= \(\dfrac{7}{6}\)
mk chi chep thua so thu 3 thoi nhe con 2 thua so con lai giu nguyen
42/30.75/23-19/23.210/38
=7/5.75.1/23-1/23.19.210/38
=7.15.1/23-1/23.210/2
=105.1/23-1/23.105=0
gia tri bieu thuc=0
a, x + 27 = 96 + 17
=> x + 27 = 113
=> x = 113 - 27
=> x = 86
b, x - 210 : 21 = 25
=> x - 10 = 25
=> x = 25 + 10
=> x = 35
c, (x + 8,7) . 10,8 = 270
=> x + 8,7 = 270 : 10,8
=> x + 8,7 = 25
=> x = 25 - 8,7
=> x = 16,3
d, 7 . x - 4 . x = 35 - 2
=> 7 . x - 4 . x = 33
=> x . (7 - 4) = 33
=> x . 3 = 33
=> x = 33 : 3
=> x = 11
#) Dấu "." là nhân nhé!
~Study well~
#KSJ
a, x + 27 = 96 + 17
=> x + 27 = 113
=> x = 113 - 27
=> x = 86
vậy_
b, x - 210 : 21 = 25
=> x - 10 = 25
=> x = 25 + 10
=> x = 35
vậy_
c, (x + 8,7).10,8 = 270
=> x + 8,7 = 25
=> x = 16,3
vậy_
d, 7x - 4x = 35 - 2
=> 3x = 33
=> x = 11
vậy_