15+15x2+15x7-100 Tinh hop ly
tinh hop ly
47.(45-15)-47.(45+15)
47.(45-15)-47.(45+15)
= 47.( 45 - 15 - 45 + 15 )
= 47 . ( -30 )
= -1410
Trả lời
47.(45-15)-47.(45+15)
=47.45-47.15-47.45+47.15
=(47.45-47.45)+(47.15-47.15)
=0+0
=0
Học tốt nha !
47 . ( 45 - 15 ) - 47 . ( 45 + 15 )
= 47 . ( 45 - 15 - 45 - 15 )
= 47 . (-30)
= -1410
Học tốt !!!
=))
35x18-9x70+100 Tinh hop ly
35x18-9x70+100
= 35x9x2 - 9x35x2 +100
= 0 +100 = 100
35x18-9x70+100
=35x9x2-9x2x35+100
=0+100
=100
35 x 18 - 9 x 70 + 100
= ( 35 x 9 x 2 ) - ( 9 x 2 x 35 ) + 100
= 0 + 100
= 100
Tinh hop ly
15 . 85 + 852
15.85+\(85^2\)
=15.85+85.85
=(15+85).85
=850
Đ/S:850
a) tìm số nguyên x, y biet ( x- 1) (y+1)=-5
b) tim các số nguyên a, b, c biết ab=-35, bc=7,abc=35
thuc hien phep tinh sau mot cach hop ly:
45-|-15|:3
45 - | -15 | : 3
= 45 - 15 : 3
= 45 - 5
= 40
\(45-|-15|\div3\)
\(=45-15\div3\)
\(=45-5\)
\(=40\)
tinh hop ly neu co the
1.12.22-6.20+3.32
2.(212.213-15:5+2018).(53.1414-14.5353)
tinh hop ly :
a, -79 . |-45| -21 |+45|
b , 29 . (23 + 15) - 23 . (29 + 15)
AI NHANH VA DUNG THI MK SE TICK CHO ^_^
a) -79.|-45| - 21.|+45|
= -79.45 - 21.45
= 45. (-79-21)
= 45. (-100)
= -4500
b) 29.(23+15) - 23.(29+15)
= 29.23 + 29.15 - 23.29 - 23.15
= (29.23 - 23.29) + (29.15 - 23.15)
= 0 + 15.(29-23)
= 15.6
= 90
tinh tong sau bang cach hop ly
a = 2+2^2+2^3+2^4+...+2^100
mong moi nguoi giup do
Ta có:
A=2+2^2+2^3+....+2^99+2^100
=>2A=2^2+2^3+2^4+....+2^100+2^101
=>2A-A=(2^2+2^3+2^4+....+2^101)-(2+2^2+2^3+....+2^99)
Phá ngoặc ra, ta được:
A=2^101-2.
P/s:Nếu bạn có máy tính cầm tay, bấm 2^100-2 bằng bao nhiêu nhé !!!Chúc bạn học tốt.
Ta có :
\(A=2+2^2+2^3+...+2^{100}\)
\(\Rightarrow2A=2^2+2^3+2^4+...+2^{101}\)
\(\Rightarrow2A-A=\left(2^2+2^3+2^4+...+2^{100}\right)-\left(2+2^2+2^3+...+2^{100}\right)\)
\(\Rightarrow A=2^{101}-2\)
Vậy \(A=2^{101}-2\)
Tinh hop ly
a) ( 36-6).(-5)+31.(-7-13)
b) -39.(85-48)-85.(39-48)
c) 48.(-21)+(-142).(-24)
d) 59.(35-15)-59.(35+15)
tinh hop ly neu co the
a) 200 - 15 . 12 + 196 : 14
b) 4,6 . 63 + 25 . 0,53 + 4,6 . 37 + 0,27 . 25
a, 200-15 .12 +196 :14 =200-180+14=34
b,4,6.63+25.0,53+4,6.37 +0.27 .25=4,6.(63+37)+25.( 0,53 +0,27)=4,6.100+25.0,8=460+20=480
a) \(200-15.12+196:14=200-180+14\) \(=34\)
b) \(4,6.63+25.0,53+4,6.37+0,27.25\) \(=4,6.63+4,6.37+25.0,53+0,27.25\)
\(=4,6.\left(63+37\right)+25.\left(0,53+0,27\right)\)
\(=4,6.100+0,8.25\)
\(=460+20=480\)