4747/2727-x=3636/5454
1 tính nhanh: a/
[ 2727/ 3636 + 1212/5454 ] x 9/10
lưu ý : / là dấu gạch phân số nha !
2, tím số nhort nhất có 3 chữ số biết rằng số chia hết cho 9, chia hết cho 5 và chia hết cho 3
1 tính nhanh: a/ [ 2727/ 3636 + 1212/5454 ] x 9/10 = (3/4 + 2/9) x 9/10
= 3/4 x 9/10 + 2/9 x 9/10
= 27/40 + 1/5
= 27/40 + 8/40
= 7/8
Tính nhanh :
a]7,3*8,3+3,8*7,3-5*7,3*0,4
b]1/10:0,1-1/8:0,125+1/2:0.5-1/4:0,25
c;(2727/3636+1212/5454)*9/70
d]120*999+120/5*2,5*125*4*0,8
a) 7.3x8.3+3.8x7.3-5x7.3x0.4
=7.3x(8.3+3.8-5x0.4)
=7.3x10.1
=73.73
b)\(\frac{1}{10}:0.1-\frac{1}{8}:0.125+\frac{1}{2}:0.5-\frac{1}{4}:0.25\)
=1-1+1-1=0
c)\(\left(\frac{2727}{3636}+\frac{1212}{5454}\right)\times\left(\frac{9}{70}\right)=\left(\frac{3}{4}+\frac{2}{9}\right)\times\left(\frac{9}{70}\right)\)
=\(\frac{35}{36}\times\frac{9}{70}\)=\(\frac{1}{8}\)
d) 120x999+\(\frac{120}{5\times2.5\times125\times4\times0.8}\)
=120x999+\(\frac{120}{5000}\)
=120x999+\(\frac{3}{125}\)
=119880.024
a 73,73
b1/8
c 119880,024
đúng nha
k mình nha mn
\(\frac{3636}{3535}\)+ \(\frac{5454}{4242}\) = ??? giúp mình với
\(\frac{3636}{3535}+\frac{5454}{4242}\)
\(=\frac{36}{35}+\frac{54}{42}\)
= \(\frac{36}{35}+\frac{9}{7}\)
= \(\frac{36}{35}+\frac{45}{35}\)
= \(\frac{81}{35}\)
2323 x 474747 - 4747 x 23232323
232323*474747-4747*232323
=232323*(474747-4747)
=232323*470000
=109191810000
tick đúng cho mik đi bạn
3636 : ( 12 x X - 91 ) = 36
3636 : (12 . x - 91) = 36
12 . x - 91 = 3636 : 36
12 . x - 91 = 101
12 . x - 91 = 101 + 91
12 . x = 192
x = 192 : 12
x = 16
Vậy x = 16
tính nhanh : 1515/2323 x 696969/545454 x 2727/1515
=15/23.(69/54./27/15)
=15/23.23/10
=3/2
\(=\dfrac{15}{23}\times\dfrac{69}{54}\times\dfrac{27}{15}\\ =\dfrac{3}{2}\)
=15/23 x (69/54 x /27/15)
=15/23 x 23/10
=3/2
3636 : ( 12 x x - 91 ) = 36
=> 12 x X-91=3636:36
=> 12 x X=101+91
=> X= 192:12
=> X=16
3636 : (12 x x - 91 ) =36
12x x-91 =3636:36
12x x-91 =101
12x x =101+91
12x x =192
x =192:12
x =16
3636 : (12 * x - 19) = 36
12 * x - 19 = 3636 : 36
12 * x - 19 = 101
12 * x = 101 + 19
12 * x = 120
x = 120 : 12
x = 10
1245 x 334 - 3636 :18
giúp