a. \(12.5^2=12.25=300\)

b. \(704:8^2.2\) \(=704:64.2=11.2=22\)

c. \(2^2.7^2.2\) \(=4.49.2=392\)

d. \(\left(96:24\right)^3=4^3=64\)

a, 300

b,22

dấu này là dấu gì vậy bạn:                           |

\(a,12.5^2=300\)

\(b,704:8^2=704:64=11\)

\(c,2^2.2^7=2^{2+7}=2^9=512\)

\(d,\left(96:24\right)^3=4^3=64\)

12.5 mũ 2 = 300

704 : 8 mũ 2 = 11

2 mũ 2 . 2 mũ 7 = 512

(96:24) mũ 3 = 64

a: =(21-11)+(22-12)+(23-13)+(24-14)

=10+10+10+10

=40

b: =(34-14)+(35-15)+(36-16)+(37-17)

=20+20+20+20

=80

a, =(21-11)+(22-12)+(23-13)+(24-14)

=10+10+10+10

=40

b. =(34-14)+(35-15)+(36-16)+(37-17)

=20+20+20+20

=80

c,55+56+57+58-35-36-37-38

  =111+57+58-35-36-37-38

  =168+58-35-36-37-38

  =226-35-36-37-38

  =191-36-37-38

  =155-37-38

  =118-38

  =80

\(\sqrt{15-6\sqrt{6}}+\sqrt{35-12\sqrt{6}}=\sqrt{\left(3-\sqrt{6}\right)^2}+\sqrt{\left(3\sqrt{3}-2\sqrt{2}\right)^2}\)

\(=3-\sqrt{6}+3\sqrt{3}-2\sqrt{2}\)

\(\sqrt{17-3\sqrt{32}}+\sqrt{17+3\sqrt{32}}=\sqrt{\left(3-2\sqrt{2}\right)^2}+\sqrt{\left(3+2\sqrt{2}\right)^2}\)

\(=3-2\sqrt{2}+3+2\sqrt{2}=6\)

\(\sqrt{49-5\sqrt{96}}+\sqrt{49+5\sqrt{96}}=\sqrt{\left(5-2\sqrt{6}\right)^2}+\sqrt{\left(5+2\sqrt{6}\right)^2}\)

\(=5-2\sqrt{6}+5+2\sqrt{6}=10\)

\(\sqrt{13-\sqrt{160}}+\sqrt{53+4\sqrt{90}}=\sqrt{\left(2\sqrt{2}-\sqrt{5}\right)^2}+\sqrt{\left(3\sqrt{5}+2\sqrt{2}\right)^2}\)

\(=2\sqrt{2}-\sqrt{5}+3\sqrt{5}+2\sqrt{2}=2\sqrt{5}+4\sqrt{2}\)

a: \(\sqrt{15-6\sqrt{6}}+\sqrt{35-12\sqrt{6}}\)

\(=3-\sqrt{6}+3\sqrt{3}-2\sqrt{2}\)

b: \(\sqrt{17-3\sqrt{32}}+\sqrt{17+3\sqrt{32}}\)

\(=3-2\sqrt{2}+3+2\sqrt{2}\)

=6

c: Ta có: \(\sqrt{49-5\sqrt{96}}+\sqrt{49+5\sqrt{96}}\)

\(=5-2\sqrt{6}+5+2\sqrt{6}\)

=10

d: Ta có: \(\sqrt{13-\sqrt{160}}+\sqrt{53+4\sqrt{90}}\)

\(=\sqrt{13-4\sqrt{10}}+\sqrt{53+4\sqrt{90}}\)

\(=2\sqrt{2}-\sqrt{5}+3\sqrt{5}+2\sqrt{2}\)

\(=2\sqrt{5}+4\sqrt{2}\)

a. Ta có: 
24 = 2³ . 3
10 = 2 . 5
BCNN (24,10) = 2³. 3 . 5 = 120
BC (24,10) = B (120) = {0; 120; 240; 360; 480; 600; ....}

Bạn dựa vào câu a) làm những câu còn lại nhé!