a, 6.3+(-3.7)+2.4+(-0.3)
b, (-4.9)+5.5+4.9+(-5.5)
a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
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height="300"><embed src="https://www.youtube.com/embed/vhcwrgVafCc?autoplay=1" width="400" height="300">
a) 6.3+(-3.7)+2.4+(-0.3)
b)(-4.9)+5.5+4.9+(-5.5)
c)2.9 +3.7+(-4.2)+(-2.9)+4.2
d)(-6.5).2.8+2.8.(-3.5)
a) 6,3 + (-3,7) + 2,4 + (-0,3)
= (6,3 + 2,4) + [-3,7 + (-0,3)]
= 8,7 + (-4)
= 4,7
b) (-4,9) + 5,5 + 4,9 + (-5,5)
= (-4,9 + 4,9) + [5,5 + (-5,5)]
= 0 + 0
= 0
c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2
= [2,9 + (-2,9)] + (-4,2 + 4,2) + 3,7
= 0 + 0 + 3,7
= 3,7
d) (-6,5) . 2,8 + 2,8 . (-3,5)
= 2,8 . [-6,5 + (-3,5)]
= 2,8 . (-10)
= -28.
các bạn giải nhanh hộ mình đc ko Tính:
A)5.4^15.9^9-4.9^10.8^9/6^19.4^5.5-7.2^29.27^6
B)2^10.4^5-9^2.4^6/3^5.8^4+2^6.6^6 - 25^5.7^3-49^2.25^3.625/14^3.5^9+(125.7)^3
Mấy cậu giúp tớ với
1.Rút gọn: 2^5.7+2^6/ 2^5.5^2-2^5.7
2. So sánh: 3.7+6.21+9.28/ 4.9+8.27+12.36 và 49/84
3. Tìm X biết:
a, (2x+14):2^2-3=1
b, 3^2x-5+2=29
Giải nhanh rồi tớ tick nhé
Bài làm
1. Rút gọn
\(\frac{2^5.7+2^6}{2^5.5^2-2^5.7}=\frac{2^5\left(7+2\right)}{2^5\left(25-7\right)}=\frac{9}{18}=\frac{1}{2}\)
2. So sánh
Ta có: \(\frac{2.7+6.21+9.28}{4.9+8.27+12.36}\)
\(=\frac{14+126+252}{36+216+432}=\frac{392}{684}=\frac{98}{171}\)
Mà ta thấy, mẫu số của phân số 98/171 lớn hơn mẫu số của phân sốc 49/84 ( 171 > 84 )
=> \(\frac{98}{171}< \frac{49}{84}\)
Vậy \(\frac{2.7+6.21+9.28}{4.9+8.27+12.36}< \frac{49}{84}\)
3. Tìm x
a) ( 2x + 14 ) : 22 - 3 = 1
( 2x + 14 ) : 4 - 3 = 1
( 2x + 14 ) : 4 = 1 + 4
( 2x + 14 ) : 4 = 5
2x + 14 = 5 x 4
2x + 14 = 20
2x = 6
x = 3
Vậy x = 3
b) 32x - 5 + 2 = 29
9x - 5 + 2 = 29
9x - 5 = 27
9x = 32
x = 32 : 9 = \(\frac{32}{9}\)
Vậy x = \(\frac{32}{9}\)
Tính nhanh
\(\frac{4^6.3^4.9^5}{6^{12}}\)
\(\frac{3^{10}.11+9^5.5}{3^9.2^4}\)
2100-299-298-..-22-2
38:36+(22)4:29
= 2100 - (299 + 298 + ... + 22 + 2)
Đặt A = 299 + 298 + ... + 22 + 2
2A = 2100 + 299 + ... + 23 + 22
2A - A = (2100 + 299 + ... + 23 + 22) - (299 + 298 + ... + 22 + 2)
A = 2100 - 2
Ta có:
2100 - 299 - 298 - ... - 22 - 2
= 2100 - (2100 - 2)
= 2100 - 2100 + 2
= 0 + 2
= 2
38 : 36 + (22)4 : 29= 32 + 28 : 29
\(=9+\frac{1}{2}\)
\(=\frac{18}{2}+\frac{1}{2}=\frac{19}{2}\)
2^2.4^4.2^6.2.2=
2.2^3.2^7.2^4=
3^2.3=
3^4.3^3.3=
3.3^5.3^4.3^2=
3.3^6.3^7.3^4=
4.4^3=
4^5.4.4^7=
4.4^3.4^5.4^6=
5.5^6
5.5^4=
5.5^2.5^4=
5.5^3.5^4.5^6=
5.5^6.5^4.5^3=
x.x^2
x.x^3.x^5=
a.a^4
a.a^2.a^4.a^5.a^7=
a.a^3.a^5.a^6
a^4.a.a^5.a^6.a=
x.x^3.x^4=
x^5.x^4.x.x^7.x^6=
7.7^2=
7.7^2.7^4.7^5=
7^3.7^5.7.7^4=
7^2.7.7^6.7^6.7^3=
10.10^2=
10.10^2=
10.100.10^3=
10.100.10^4.1000=
10^2.10^4.100.1000=
làm ơn giúp mình ,bạn nào làm nhanh đúng mình chọn cho nhanh nha mọi người
Bài làm
22.44.26.2.2=22.28.26.22=218
2.23.27.24=215
32.3=33=27
34.33.3=38
3.35.34.32=312
3.36.37.34=318
4.43=44
45.4.47=413
4.43.45.46=415
5.56=57
5.54=55
5.52.54=57
5.53.54.56=514
5.56.54.53=514
x.x2=x3
x.x3.x5=x9
a.a4=a5
a.a2.a4.a5.a7=a19
a.a3.a5.a6=a15
a.a4.a.a5.a6.a=a18
x.x3.x4=x8
x5.x4.x.x7.x6=x23
7.72=73
7.72.74.75=712
73.75.74.7=713
72.7.76.76.73=718
10.102=103
10.100.103=106
10.100.104.1000=1010
102.104.100.1000=1011
Tk nha !
Cho mk hỏi câu C=\(\dfrac{4^6.3^4.9^5}{6^{12}}\)vs ạ
Ta có : \(C=\dfrac{4^6.3^4.9^5}{6^{12}}=\dfrac{\left(2^2\right)^6.3^4.\left(3^2\right)^5}{\left(2.3\right)^{12}}=\dfrac{2^{12}.3^4.3^{10}}{2^{12}.3^{12}}=3^{4+10-12}=3^2=9\)
\(C=\dfrac{4^6\cdot3^4\cdot9^5}{6^{12}}=\dfrac{2^{12}\cdot3^4\cdot3^{10}}{3^{12}\cdot2^{12}}=3^2=9\)
\(C=\dfrac{4^6.3^4.9^5}{6^{12}}\)
\(C=\dfrac{\left(2^2\right)^6.3^4.\left(3^2\right)^5}{\left(2.3\right)^{12}}\)
\(C=\dfrac{2^{12}.3^4.3^{10}}{2^{12}.3^{12}}\)
\(C=\dfrac{2^{12}.3^{14}}{2^{12}.3^{12}}\)
\(C=3^2=9\)
\(\left(4^6.3^4.9^3\right):6^{12}\)
\(\left(4096.81.729\right):2176782336\)
\(\left(331776.729\right):2176782336\)
\(\left(241864704\right):2176782336\)
\(\frac{4^6.3^4.9^3}{6^{12}}=\frac{2^{12}.3^4.3^6}{2^{12}.3^{12}}=\frac{2^{12}.3^{10}}{2^{12}.3^{12}}=\frac{1}{3^2}=\frac{1}{9}\)
=(2^12x3^10):2^12:3^12
=2^12:2^12x3^10:3^12
=3^(-2)
=1/9
tìm x biết
(x+0.1)+(x+0.2)+(x+0.3)+...................+(x+4.9)=44.2
=(x+x+x+........+x)+(0.1+0.2+0.3+.........+4.9)=44.2
/ có 49x hay 50x nhe tự xem đi /
44.2 - ((4.9+0.1). k/c :2)=(x+x+x+..........+x)=?
lấy ? : (cái trong //)= x
can you k me