\(d,-\dfrac{3}{26}.\left(-\dfrac{15}{19}\right)+\dfrac{2}{19}.\left(-\dfrac{3}{26}\right)\\=-\dfrac{3}{26}.\left(-\dfrac{15}{19}+\dfrac{2}{19}\right)\\ =-\dfrac{13}{19}.\left(-\dfrac{3}{26}\right)\\ =\dfrac{3}{38}. \)

d) \(\dfrac{-3}{26}\times\left(\dfrac{-15}{19}\right)+\dfrac{2}{19}\times\dfrac{-3}{26}\)

\(=\dfrac{-3}{26}\times\left[\left(\dfrac{-15}{19}\right)+\dfrac{2}{19}\right]\)

\(=\dfrac{-3}{26}\times\dfrac{-13}{19}\)

\(=\dfrac{3}{38}\)

`@` `\text {Ans}`

`\downarrow`

Lớp 6 - 8 phải k ạ? Lớp 5 chưa học dạng ntnay.

\(15 . ( x- 3 ) + 3 (x+ 26 ) = 19 . ( x + 1)\)

`=>`\(15x-45+3x+78=19x+19\)

`=> 15x - 45 + 3x + 78 - 19x - 19 = 0`

`=> (15x + 3x - 19x) + (-45 + 78 - 19) = 0`

`=> -x + 14 = 0`

`=> -x = -14`

`=> x = 14`

Vậy, `x = 14.`

\(B=\dfrac{7.2^{10}.3^{10}2.^{21}.3^6-2^{19}.2^{15}.3^{15}}{3^2.2^{15}.3^{15}.2^{13}-2^2.3^{15}.2^{26}}=\)

\(=\dfrac{2^{31}.3^{15}\left(7.3-2^3\right)}{2^{28}.3^{15}\left(3^2-1\right)}=\dfrac{2^{31}.13}{2^{31}}=13\)

giúp mình với huhu

ai trả lời đúng đầu tiên mình cho 2 tick

(26/19 - 7/19)x ( 8/11+3/11)

= 1x1 

=1

lớp 1 mà cậu

4.24.5²-(3³.18+3³.12)

=4.24.25-[27.(18+12)]

=(4.25).24-[27.30]

=100.24-810

=2400-810

=1590

4.24.5^2-(3^3.18+3^3.12)

31.15.7^2.4-31.49.40

1+2+3+4+5+6+7+8+9+10

1+3+5+7+9+11+13+15+19

2+6+10+14+22+23+26+34

5+8+11+14+17+20+23+26+29

1+6+11+16+21+26+31+36+41+47+51

10+13+16+19+22+25+28+31+34+37+40

5+7+9+11+13+15+17+3+8+13+18+23+28

4+7+10+13+16+19+5+9+13+17+21+25 = 1590

#HT#

= (26/15-7/15):19/45

=\(\dfrac{19}{15}:\dfrac{19}{45}\)

=\(\dfrac{19}{15}x\dfrac{45}{19}=\dfrac{45}{15}=3\)

= ( 26/15 - 7/15 ) : 19/45

= 19/15 : 19/15

=1

\(\dfrac{26}{15}:\dfrac{19}{45}-\dfrac{7}{15}:\dfrac{19}{45}\)

\(=\left(\dfrac{26}{15}-\dfrac{7}{15}\right):\dfrac{19}{45}\)

\(=\dfrac{19}{15}:\dfrac{19}{45}\)

\(=\dfrac{19}{15}\) x \(\dfrac{45}{19}\)

\(=\dfrac{855}{285}=3\)

ban tu lam di,luoi the

bai ki vay ,

\(B=\frac{7.6^{10}.2^{20}.3^6-2^{19}.6^{15}}{9.6^{19}.2^9-4.3^{17}.2^{26}}\)

\(B=\frac{7.\left(2.3\right)^{10}.2^{20}.3^6-2^{19}.\left(2.3\right)^{15}}{3^2.\left(2.3\right)^{19}.2^9-2^2.3^{17}.2^{26}}\)

\(B=\frac{7.2^{30}.3^{16}-2^{34}.3^{15}}{3^{21}.2^{11}-2^{28}.3^{17}}\)

\(B=\frac{2^{30}.3^{15}.\left(7.3-2^4\right)}{3^{17}.2^{11}.\left(3^4-2^{17}\right)}\)

\(B=\frac{2^{19}.\left(21-2^4\right)}{3^2.\left(3^4-2^{17}\right)}\)

@_@ tự tính!

\(B=\frac{7.\left(2.3\right)^{10}.2^{20}.3^6-2^{19}.\left(2.3\right)^{15}}{3^2.\left(2.3\right)^{19}.2^9-4.3^{17}.2^{26}}\\ B=\frac{7.2^{10}.3^{10}.2^{20}.3^6-2^{19}.2^{15}.3^{15}}{3^2.2^{19}.3^{19}.2^9-2^2.3^{17}.2^{26}}\\ B=\frac{7.2^{30}.3^{16}-2^{34}.3^{15}}{3^{21}.2^{28}-2^{28}.3^{17}}\)   

\(B=\frac{7.2^{30}.3.3^{15}-2^{34}.3^{15}}{3^{15}.3^6.2^{28}-2^{28}.3^{15}.3^2}\\ B=\frac{3^{15}.\left(7.2^{30}.3-3^{34}\right)}{3^{15}.\cdot\left(3^6-3^2\right)}\\ B=\frac{7.2^{30}.3-3^{34}}{3^6-3^2}\)