Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
A) 15.7.20
= 3.5.7.20
= (3.7).(5.20)
= 21.100
= 2100
B) 8.12.125.4
= (8.125).(12.4)
= 1000.48
= 48000
C) 72.125.6
= 8.9.125.6
= (8.125).(9.6)
= 1000.54
= 54000
D) 24.25.26
= 4.6.25.26
= (4.25).(6.26)
= 100.156
= 15600
a,15.7.20
=15.20.7
=300.7
=2100
b,8.12.125.4
=(8.125).(12.4)
=1000.48
=48000
c,72.125.6
=6.125.72
=750.72
=54060
d,24.25.26
=(24.25).26
=15600
**** mình nhé bn
1 . ta co : \(x-96=\left(443-x\right)-15\)
\(\Rightarrow x-96=443-x-15\)
\(\Rightarrow x-96=428-x\)
\(\Rightarrow2\times x=524\)
\(\Rightarrow x=262\)
2. ta co : \(371+731+271+531\)
\(=370+1+730+1+270+1+530+1\)
\(=\left(370+530\right)+\left(730+270\right)+1+1+1+1\)
\(=900+1000+4=1904\)
1)x-96=(443-x)-15
x-96=443-x-15
x-96=443-15-x
x-96=428-x
x+x=428+96
2x=524
x=524:2=262
(p ơi đầu bài bài 2 sai r phải là :( 371+731-271-531) ms đúng
a) 18.123 + 9.456.2 + 3.6
= 18.123 + 18.456 + 18
= 18 ( 123 + 456 + 1 )
= 18 . 580
= 10440
b) 1+4+7+10+...+49+52+55+58-410
= ( 58 + 1 ) . 20 : 2 - 410
= 590 - 410
= 180
\(\frac{2020.2020+3030}{2021.2021-1011}\)
\(=\frac{2020.2020+3030}{\left(2020+1\right)\left(2020+1\right)+3030}\)
\(=\frac{2020.2020+3030}{\left(2020+1\right)2020+2020+1-1011}\)
\(=\frac{2020.2020+3030}{2020.2020+2020+2020+1-1011}\)
\(=\frac{2020.2020+3030}{2020.2020+3030}=1\)