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Câu 1:
a: =126+5=131
b: =-564-724+564+224=-500
c: =3x25+2-8
=75+2-8
=77-8
=69
d: =1024:32+140:70-49
=32-49+2
=-15
Bài 1: a, 73.74 + 73 + 73.65
= 73.( 74 + 1 + 65)
= 73. 140 = 10220
b, (-45) +(-35) = - ( 35 + 45) = 80
c, 299 - 6.[ (12 + 2): 5 - 3]
299 - 6.(2,8 - 3)
299 - 6.(-0,2)
299 + 1,2
= 300,2
Bài 2:
a, \(x-5\) = -15
\(x\) = -15 + 5
\(x\) = -10
b, 5\(x\) - 2.5 = 20.(-2)
5\(x\) - 10 = -40
5\(x\) = -40 + 10
5\(x\) = - 30
\(x\) = - 6
c, 15 - \(x\) = -3.4
15 - \(x\) = -12
\(x\) = 15 - ( -12)
\(x\) = 27
a: \(=\dfrac{7+12-6}{13}=1\)
b: \(=\dfrac{13}{10}\cdot\dfrac{6-26}{13}=\dfrac{-20}{10}=-2\)
c: \(=\dfrac{3}{4}\cdot2-\dfrac{5}{2}\cdot\dfrac{-4}{3}=\dfrac{3}{2}+\dfrac{20}{6}=\dfrac{3}{2}+\dfrac{10}{3}=\dfrac{29}{6}\)
d: \(=\dfrac{3}{8}\cdot\dfrac{8}{5}+\dfrac{3}{5}\cdot\dfrac{2}{7}+\dfrac{3}{5}\cdot\dfrac{5}{7}=\dfrac{3}{5}+\dfrac{3}{5}=\dfrac{6}{5}\)
cảm ơn bn, mình đặt câu hỏi, bn thườg xuyên trả lời câu hỏi của mình. Thank you very much.
a, (-25) + 276 - (276 - 25)
= (-25) + 276 - 276 + 25
= [ (-25) + 25] - (276 - 276)
= 0 - 0
= 0
b, 24 x 46 + 24 x 53 + 24
= 24 x ( 46 + 53 + 1)
= 24 x 100
= 2400
a; - \(\dfrac{10}{13}\) + \(\dfrac{5}{17}\) - \(\dfrac{3}{13}\) + \(\dfrac{12}{17}\) - \(\dfrac{11}{20}\)
= - (\(\dfrac{10}{13}\) + \(\dfrac{3}{13}\)) + (\(\dfrac{5}{17}\) + \(\dfrac{12}{17}\)) - \(\dfrac{11}{20}\)
= - 1 + 1 - \(\dfrac{11}{20}\)
= 0 - \(\dfrac{11}{20}\)
= - \(\dfrac{11}{20}\)
b; \(\dfrac{3}{4}\) + \(\dfrac{-5}{6}\) - \(\dfrac{11}{-12}\)
= \(\dfrac{9}{12}\) - \(\dfrac{10}{12}\) + \(\dfrac{11}{12}\)
= \(\dfrac{10}{12}\)
= \(\dfrac{5}{6}\)
c; [13.\(\dfrac{4}{9}\) + 2.\(\dfrac{1}{9}\)] - 3.\(\dfrac{4}{9}\)
= [\(\dfrac{52}{9}\) + \(\dfrac{2}{9}\)] - \(\dfrac{4}{3}\)
= \(\dfrac{54}{9}\) - \(\dfrac{4}{3}\)
= \(\dfrac{14}{3}\)
Câu 1:
A={1;3;5;7;9}
Câu 2:
A. 24 x 82 + 24 x 18 - 100
= 24 x (82 + 18) - 100
= 24 x 100 - 100
= 2400 - 100 = 2300
B.12 + 3 [ 39 - (5 - 2 )2 ]
= 12 + 3. [39 - 32 ]
= 12 + 3 . [39-9]
= 12 + 3.30
= 12 + 90 = 102
tính hợp lý nếu có thể
a) 2.25.9.4
b)35.112-12.35+50
c)16+(516 : 514 - 90)
d) 24.7 - [181 - ( 13 - 4)2 ]
a: \(2\cdot25\cdot9\cdot4=25\cdot4\cdot9\cdot2=18\cdot100=1800\)
b: \(35\cdot112-12\cdot35+50\)
\(=35\left(112-12\right)+50\)
=3500+50
=3550
c: \(16+\left(5^{16}:5^{14}-9^0\right)\)
\(=16+5^2-1\)
=25+15
=40
d: \(24\cdot7-\left[181-\left(13-4\right)^2\right]\)
\(=168-181+9^2\)
=81-13
=68
a)2.25.9.4
=(25.4).(9.2)
=100.18
1800
b)35.112-12.35+50
=35.(112-12)+50
=35.100+50
=3500+50
=3550
c)\(16+\left(5^{16}:5^{14}-9^0\right)\)
\(=16+\left(5^2-9^0\right)\)
\(=16+\left(25-1\right)\)
\(=16+24\)
\(=40\)
d)\(24.7-[181-\left(13-4\right)^2]\)
\(=24.7-[181-9^2]\)
\(=24.7-[181-81]\)
\(=24.7-100\)
\(=168-100\)
\(=68\)
78.31+78.68+78
=78.31+78.68+78.1
=78.(31+68+1)
=78.100
=7800
1024:(22.7+22.25)
=1024:[22.(7+25)]
=1024:128
=8
24-[20-(5-1)2]
=24-[20-42]
=24-[20-16]
=24-4
=20
x3=64
=>x3=43
=>x=4
2x+1=128
2x.21=128
2x=128:2
2x=64
2x=26
=>x=6
a ) 7800
b) 8
c)20
tim x
a)x=4
b) x = 6