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13140-20601:327+4245=13140-63+4245
=13077+4245
=17322
dài quá mk cũng phải lm bt nữa bn chép tạm 1 câu vậy
a) 13140 - 20601 : 327 - 4245
= 13140 - 63 - 4245
= 13077 - 4245
= 8832
b) 782,60 - ( 1784 - 1569 ) x 46
= 782,60 - 215 x 46
= 782,60 - 9890 = -9107,4
Tìm x :
a) 65 * x + 95784 = 10159
=> 65*x = 10159 - 95784
=> 65 *x = -85,625
b) 5,67 - x = 6,7 + 1,8
5,67 - x = 8,5
=> x = 5,67 - 8,5
=> x = -2,83
17,28:(2,92+6,68)+12,64
=17,28:10+12,64
=1,728+12,64
=14,368
679+679x123-679x24
=679x1+679x123+679x24
=679x(1+123-24)
=679x100
=67900
245x327-245x18-9x245
=245x(327-18-9)
=245x300
=73500
679 +679 x 123 - 679 x 24
= 679 x ( 1 + 123 - 24 )
= 679 x 100
= 67900
245 x 327 - 245 x 18 - 9 x 245
= 245 x ( 327 - 18 - 9 )
= 245 x 300
= 73500
a)
36 x 532 + 63 x 532 + 532
= 36 x 532 + 63 x 532 + 532 x 1
= ( 36 + 63 + 1 ) x 532
= ( 99 + 1 ) x 532
= 100 x 532
= 53200
b)
679 + 679 x 123 - 679 x 24
= 679 x 1 + 679 x 123 - 679 x 24
= 679 x ( 1 + 123 - 24 )
= 679 x ( 124 - 24 )
= 679 x 100
= 67900
c)
245 x 327 - 245 x 18 - 9 x 245
= 245 x ( 327 - 18 - 9 )
= 245 x ( 309 - 9 )
= 245 x 300
= 73500
36 . y + 46 . y = 4000
y . ( 36 + 46 ) = 4000
y . 82 = 4000
y = 4000 : 82
y = 48,78048780487805
36 . y + 46 . y = 4000
=> y. ( 36 + 46 ) = 4000
=> y = 4000
=> y = 4000 : 82
=> y = 2000/41
A = \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) + \(\dfrac{1}{64}\) + \(\dfrac{1}{128}\)
A \(\times\) 2 = ( \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) + \(\dfrac{1}{64}\) + \(\dfrac{1}{128}\)) \(\times\) 2
A \(\times\) 2 = 1 + \(\dfrac{1}{2}\)+ \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) + \(\dfrac{1}{64}\)
A \(\times\) 2 - A =1 + \(\dfrac{1}{2}\) + \(\dfrac{1}{4}\) + \(\dfrac{1}{8}\) + \(\dfrac{1}{16}\) + \(\dfrac{1}{32}\) + \(\dfrac{1}{64}\)- \(\dfrac{1}{2}\)-\(\dfrac{1}{4}\)-\(\dfrac{1}{8}\)-\(\dfrac{1}{16}\)-\(\dfrac{1}{32}\)-\(\dfrac{1}{64}\)-\(\dfrac{1}{128}\)
A\(\times\)(2-1) =1+(\(\dfrac{1}{2}\)-\(\dfrac{1}{2}\)) +(\(\dfrac{1}{4}\)-\(\dfrac{1}{4}\))+(\(\dfrac{1}{8}\)-\(\dfrac{1}{8}\))+(\(\dfrac{1}{16}\)-\(\dfrac{1}{16}\))+(\(\dfrac{1}{32}\)-\(\dfrac{1}{32}\))+(\(\dfrac{1}{64}\)-\(\dfrac{1}{64}\))-\(\dfrac{1}{128}\)
A = 1 - \(\dfrac{1}{128}\)
A = \(\dfrac{127}{128}\)
A
9 km 26 m = 9,026 km
892mm = 0,892 mm
4m 783 mm = 47,83 dm
106 m = 1,06hm
8 dm 9 mm = 0,809m
Số đó là: 46 : 20 \(\times\) 100 = 230
\(\dfrac{1}{2}\) của số đó là: \(230\) \(\times\) \(\dfrac{1}{2}\) = 115