Tìm: \(\left| { - 59} \right|;\left| { - \frac{3}{7}} \right|;\left| {1,23} \right|;\left| { - \sqrt 7 } \right|\)
Những câu hỏi liên quan
Bài 1 :
a) \(16.\left(38-2\right)-38\left(16-1\right)\)
b) \(\left(-41\right).\left(59+2\right)+59\left(41-2\right)\)
Bài 2 :
Tìm các số x ; y ; x biết rằng :
\(\)x + y = 2 ; y + z = 3 ; z + x = -5
Bài 3 : Tìm x ; y \(\in\) Z biết rằng :
( y + 1 ) . xy - 1 ) = 3
Bài 1 : Tính nhanh
a) 16.(38−2)−38(16−1)16.(38−2)−38(16−1)
b) (−41).(59+2)+59(41−2)(−41).(59+2)+59(41−2)
Bài 2 :
Tìm các số x ; y ; x biết rằng :
x + y = 2 ; y + z = 3 ; z + x = -5
Bài 3 : Tìm x ; y ∈∈ Z biết rằng :
( y + 1 ) . xy - 1 ) = 3
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a) 16.(38−2)−38(16−1)
= 16.38 - 16.2 - 38.16 - 38.1
=-16.2 - 38.1
=-32-38
=-70
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\(\frac{\left(27\frac{5}{19}-26\frac{4}{13}\right).\left(\frac{3}{4}+\frac{19}{59}-\frac{3}{118}\right)}{\left(\frac{3}{4}+x\right)\frac{27}{33}}\) =1. Tìm x
\(\frac{\left(\frac{518}{19}-\frac{342}{13}\right).\left(\frac{177}{236}+\frac{76}{236}-\frac{6}{236}\right)}{\left(\frac{3}{4}+x\right).\frac{27}{33}}=1\)
=>\(\frac{\left(\frac{6734}{247}-\frac{6498}{247}\right).\frac{247}{236}}{\left(\frac{3}{4}+x\right).\frac{27}{33}}=1\)
=>(3/4+x)*27/33=236/247*247/236=1
3/4+x=1:27/33=33/27
x=33/27-3/4=132/108-81/108
x=51/108
Vậy x=51/108
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Tính hợp lý :
\(\left(5-\frac{43}{10}\right)-\left(\frac{42}{19}-\left(\frac{7}{2}-\frac{59}{10}\right)\right)+\frac{42}{19}+\frac{59}{10}+\frac{4}{5}\)
\(\left(5-\frac{43}{10}\right)-\left(\frac{42}{19}-\left(\frac{7}{2}-\frac{59}{10}\right)\right)+\frac{42}{19}+\frac{59}{10}+\frac{4}{5}\)
\(=5-\frac{43}{10}-\left(\frac{42}{19}-\frac{7}{2}+\frac{59}{10}\right)+\frac{42}{19}+\frac{59}{10}+\frac{4}{5}\)
\(=5-\frac{43}{10}-\frac{42}{19}+\frac{7}{2}-\frac{59}{10}+\frac{42}{19}+\frac{59}{10}+\frac{4}{5}\)
\(=5-\frac{43}{10}+\frac{7}{2}+\frac{4}{5}\)
\(=5+\frac{35}{10}+\frac{8}{10}-\frac{43}{10}=5\)
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Tìm x,y nguyên dương thỏa mãn: \(4xy-3\left(x+y\right)=59\)
\(4xy-3\left(x+y\right)=59\Rightarrow16xy-12x-12y=59.4\)
\(\Rightarrow4x\left(4y-3\right)-3\left(4y-3\right)=59.4+9\)
\(\Rightarrow\left(4x-3\right)\left(4y-3\right)=245\)
Ta có bảng sau:
| 4x-3 | 1 | 5 | 7 | 35 | 49 | 245 |
| 4y-3 | 245 | 49 | 35 | 7 | 5 | 1 |
| x | 1 | 2 | 5/2 | 19/2 | 13 | 62 |
| y | 62 | 13 | 19/2 | 5/2 | 2 | 1 |
Mà x,y nguyên dương
Vậy \(\left(x;y\right)\in\left\{\left(1;62\right),\left(2;13\right),\left(13;2\right),\left(62;1\right)\right\}\)
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Tính nhanh : \(\left(59-5^{30}\right)-\left(59+3^3-5^{30}\right)\)
Giúp mình nha , cảm ơn minna nhiều
\(\left(59-5^{30}\right)-\left(59+3^3-5^{30}\right)=59-5^{30}-59-3^3+5^{30}\)
\(=\left(59-59\right)-\left(5^{30}-5^{30}\right)-3^3\)
\(=0-3^3\)
\(=-27\)
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Tính:
\(27\dfrac{51}{59}-\left(7\dfrac{51}{59}-\dfrac{1}{3}\right)\)
\(27\dfrac{51}{59}-\left(7\dfrac{51}{59}-\dfrac{1}{3}\right)=\dfrac{1614}{59}-\left(\dfrac{464}{59}-\dfrac{1}{3}\right)=\dfrac{1614}{59}-\dfrac{1333}{177}=\dfrac{3509}{177}\)
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\(27\dfrac{51}{59}-\left(7\dfrac{51}{59}-\dfrac{1}{3}\right)=27\dfrac{51}{59}-7\dfrac{51}{59}+\dfrac{1}{3}=27+\dfrac{51}{59}-7-\dfrac{51}{59}+\dfrac{1}{3}=20+\dfrac{1}{3}=\dfrac{61}{3}\)
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\(\frac{\left(27\frac{5}{19}-26\frac{4}{13}\right)\left(\frac{3}{4}+\frac{19}{59}-\frac{3}{18}\right)}{\left(\frac{3}{4}+x\right).\frac{27}{33}}=\frac{\frac{1}{13.36}+\frac{1}{14.17}}{\frac{1}{13.15}+\frac{1}{14.16}+\frac{1}{15.17}}\)
Tìm x
\(159\left(18-59\right)-599\left(18-159\right)\)
tính nhanh hay bình thường
=77940 nha bạn
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Tìm x:
\(\frac{\left(27\frac{5}{19}-26\frac{4}{13}\right)\left(\frac{3}{4}+\frac{15}{59}-\frac{3}{118}\right)}{\left(\frac{3}{4}+x\right)\frac{27}{33}}=\frac{\frac{1}{13.16}+\frac{1}{14.17}}{\frac{1}{13.15}+\frac{1}{14.16}+\frac{1}{15.17}}\)