mk chịu

thảo bê đê đi chọn goku

bạn viết bị thiếu r

Thiếu đơn vị nhé bạn 

Bạn check lại đề nha 

HT

Bằng 1141451 :)

2487878 - 1346427 = 1141451 nhé

Ta có :

60=2².3.5

23=23

\(\Rightarrow BCNN\left(60,23\right)=2^2.3.5.23=1380\)

HT

Đáp án là 420

12346-5=

123+5=

còn cái nịt

TL

=42933600000000000000000 

nha bn

HT

258469862869222222756999999999999999999999999999999978

TL

=42933600000000000000000 

nha bn

HT

90000000000 . 67 x 80000000 . 89 = 42933600000000000000000 

TL

=37627200000000000000

nha bn

HT

-15/3<x<21/7

-3<x<3

x=2 (số nguyên tố lớn hơn 1)

HT

TL

X=3

nha bn

HT

e) \(17-\sqrt{x+5}=3\)

\(\Rightarrow\sqrt{x+5}=17-3=14\)

\(\Rightarrow x+5=14^2=196\)

\(\Rightarrow x=196-5=191\)

f) \(3^x+3^{x+4}-5.3^{x+1}=603\)

\(3^x+3^x.3^4-5.3.3^x=603\)

\(\Rightarrow3^x\left(1+3^4-5.3\right)=603\)

\(\Rightarrow3^x\left(1+81-15\right)=603\)

\(\Rightarrow3^x.67=603\Rightarrow3^x=9\Rightarrow x=2\)

g) \(\frac{x-3}{97}+\frac{x-5}{95}-\frac{x-10}{90}=-1\)

\(\Rightarrow\left(\frac{x-3}{97}-1\right)+\left(\frac{x-5}{95}-1\right)-\left(\frac{x-10}{90}-1\right)=-2\)

\(\Rightarrow\frac{x-100}{97}+\frac{x-100}{95}-\frac{x-100}{90}=-2\)

\(\Rightarrow\left(x-100\right)\left(\frac{1}{97}+\frac{1}{95}-\frac{1}{90}\right)=-2\)

\(\Rightarrow\left(x-100\right).\frac{1613}{165870}=-2\)

\(\Rightarrow x-100=-2:\frac{1613}{165870}=-2.\frac{165870}{1613}=-\frac{331740}{1613}\)

\(\Rightarrow x=-\frac{331740}{1613}+100=-\frac{170440}{1613}\approx-105,667\)