=24/21+150/175

<=>8/7+6/7=14/7=2

Đúng rồi đó, bằng 2.
Ta có: 7/21+3/21+14/21=7+3+14/21=24/21
125/175+25/175=125+25/175=150/175
Vì 24/21=8/7;150/175=6/7 nên 8/7+6/7=14/7=2
 

bằng 2 chứ sao trăng gì nữa

a)54 : 3³ + 6.5²

= 54 : 27 + 6.25

= 2 + 150

= 152

b) 45.26 + 45.74 - 1500

= 45.(26 + 74) - 1500

= 45.100 - 1500

= 4500 - 1500

= 3000

c) 125 + 132 + (-125) + (-21)

= [125 + (-125)] + [132 + (-21)]

= 0 + 111

= 111

d) 11 - 13 + 15 - 17 + 19 - 21 + 23 - 25

= -2 + (-2) + (-2) + (-2)

= (-4) + (-2) + (-2)

= (-8)

2, dễ lắm em làm được mà

\(\frac{7}{21}+\frac{3}{21}+\frac{14}{21}+\frac{125}{175}+\frac{25}{175}\)

\(=\left(\frac{7}{21}+\frac{3}{21}\right)+\left(\frac{125}{175}+\frac{25}{175}\right)+\frac{14}{21}\)

\(=\frac{10}{21}+\frac{18}{21}+\frac{14}{21}\)

\(=\frac{10+18+14}{21}\)

\(=2\)

\(1\frac{4}{25}+\frac{7}{21}-\frac{4}{25}+0,5+\frac{14}{21}\)

\(=\left(1\frac{4}{25}-\frac{4}{25}\right)+\left(\frac{7}{21}+\frac{14}{21}\right)+0,5\)

\(=1+0+0,5\)

\(=1,5\)

\(15\frac{1}{4}:\frac{-5}{8}-25\frac{1}{4}:\frac{-5}{8}\)

\(=-\frac{8}{5}.\left(15\frac{1}{4}-25\frac{1}{4}\right)\)

\(=-\frac{8}{5}.\left(-10\right)\)

\(=16\)

2 câu đấy à?

\(125+173+175+27=\left(125+175\right)+\left(173+27\right)=300+200=500\)

\(125\times75+125\times25=125\times\left(75+25\right)=125\times100=12500\)

\(=\dfrac{75:25}{100:25}+\dfrac{18}{21}+\dfrac{19}{32}+\dfrac{1}{4}+\dfrac{3}{21}+\dfrac{13}{32}\\ =\left(\dfrac{3}{4}+\dfrac{1}{4}\right)+\left(\dfrac{18}{21}+\dfrac{3}{21}\right)+\left(\dfrac{19}{32}+\dfrac{13}{32}\right)\\ =1+1+1=3\)

= (19/32+13/32) + (18/21+3/21) + 75/100+1/4

= 1+1+75/100+1/4

= 2+75/100+1/4

= 11/4+1/4

= 3

Đáp án là 3 nha em