\(\text{35 + (–47) – |–12|}\)

\(=-12-12\)

\(=-24\)

\(\text{(–15) – 70 : (–14) + (–32) . (–2)}\)

\(=-15+5+64\)

\(=-10+64\)

\(=54\)

\(\text{ 15 – 12 . (-3)^2 – 135 : |–15|}\)

\(=15-12.9-135:15\)

\(=15-108-9\)

\(=-102\)

Tính hợp lý:

\(\text{ –24 . 78 + 24(–35) – 24(–13)}\)

\(=24.\left(-78+\left(-35\right)-\left(-13\right)\right)\)

\(=24.\left(-100\right)\)

\(=-2400\)

học tốt

dsfsd

tớ ko hiểu

\(\left(324.359+24\right):\left(137.10+357.322\right)\)

\(=\left(116316+24\right):\left(1370+114954\right)\)

\(=116340:116324\)

\(=\dfrac{29085}{29081}\)

\(17.\left(15-16\right)+16.\left(17-20\right)\)

\(=17.15-17.16+16.17-16.20\)

\(=17.15-16.20+\left(17.16-17.16\right)\)

\(=255-320+0\)

\(=-65\)

CHÚC BN HỌC TỐT!!!!!

17(15-16)+16(17-20)

=17.(-1)+16.(-2)

=-17+(-32)

=-49

bài ở trên tui sai đó

=257*(93-27+24)

=257*90

=23130

tk cho mk nhe

mk nhanh nhat

kb voi mk roi mk tk lai cho 3 luon

=257x(93-27+24)=257x90 =23130

bằng 23130

-38.(25-4)+25.(-4+38)

=-38.25-(-38).4+25.(-4)+25.38

=[-38.25+25.38]+[25.(-4)-(-38).4]

=0+[-25.4-(-38).4]

=4.(-25+38)

=4.13

=52

= -38.25+38.4 + 25.(-4)+25.38

=(-38.25-25.38)+38.4+25.(-4)

=0 + 4.(38-25)

= 4.13

=52

100 phần trăm đúng 

Nhớ k nha

B = 1/6 + 2/15 + 3/40 + 5/104 + 8/273 + 13/714

B = 1/2×3 + 2/3×5 + 3/5×8 + 5/8×13 + 8/13×21 + 13/21×34

B = 1/2 - 1/3 + 1/3 - 1/5 + 1/5 - 1/8 + 1/8 - 1/13 + 1/13 - 1/21 + 1/21 - 1/34

B = 1/2 - 1/34

B = 17/34 - 1/34

B = 16/34 = 8/17