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(dấu chấm là dấu nhân nha e)
*\(\dfrac{1}{2}\). \(\dfrac{1}{4}\)+\(\dfrac{3}{4}\)
= \(\dfrac{1}{8}\)+\(\dfrac{3}{4}\)
= \(\dfrac{1}{8}\)+\(\dfrac{6}{8}\)= \(\dfrac{7}{8}\)
*\(\dfrac{3}{4}\).\(\dfrac{5}{6}\).\(\dfrac{8}{15}\)
= \(\left(\dfrac{3}{4}.\dfrac{8}{15}\right)\).\(\dfrac{5}{6}\)
= \(\dfrac{2}{5}\).\(\dfrac{5}{6}\)
= \(\dfrac{1}{3}\)
*\(\dfrac{12}{19}\): \(\dfrac{17}{38}\).\(\dfrac{16}{9}\)
= \(\dfrac{12}{19}\). \(\dfrac{38}{17}\).\(\dfrac{16}{9}\)= 2,5
a) ( 36 x 28 + 36 x 45 ) : 73
= 36 x (28 + 45 ):73
=36 x 73 :73
= 36 x (73 : 73)
= 36 x 1
= 36
b) ( 98 x 17 - 26 x 17 ) : 72
= 17 x (98-17):72
= 17 x 72 :72
=17 x (72 :72)
= 17 x 1
= 17
a) ( 36 x 28 + 36 x 45 ) : 73 = 36
b) ( 98 x 17 - 26 x 17 ) : 72 = 17
\(x\times282-270\times x=1512\\ x\times\left(282-270\right)=1512\\ x\times12=1512\\ x=1512:12\\ x=126\)
117 x 36 + 117 x 72 - 17 x 72 - 17 x 36
= ( 117 - 17 ) x 36 - ( 117 - 17 ) x 72
= 100 x 36 - 100 x 72
= 100 x ( 36 - 72 )
= 100 x -36
= -3600
____________________________________
408 x 53 - 5 x 204 - 204
= 408 x 53 - 5 x 204 - 204 x 1
= 408 x 53 - ( 5 - 1 ) x 204
= 408 x 53 - 4 x 204
= 21624 - 816
= 20808
a, = 113 x (54+45+1) = 113 x 100 = 11300
b, = (36+62) x (117-17) = 98 x 100 = 9800
k mk nha
Ta có : 1200:24-(17-x)=36
=> 50-(17-x)=36
=>17-x=50-36
=>17-x=14
=>x=17-14=3
50 - (17 - x ) = 36
17 - x = 50-36= 14
x = 17 - 14 = 3
Vậy x = 3
36x17+12x34+6x30
=6x6x17+6x2x34+6x30
=6x102+6x68+6x30
=6x(102+68+30)
=6x200
=1200
=12x3x17 + 12x34 + 6x2x15
=12x51 + 12x34 + 12x15
= 12x(51+34+15)
=12x100
=1200
(x+17)=1512 :36
(x+17)=42
x=42-17
x=25
tk nha
x + 17 = 1512 / 36
x + 17 = 42
x = 42 - 17
x = 25