Tính nhanh:
\(\frac{60\times48+120\times31}{55\times16+55\times4}\)
Tính \(\frac{39}{7\times16}+\frac{65}{16\times31}+\frac{52}{31\times43}+\frac{26}{43\times49}\)
tính \(\frac{4^{12}}{4\times5\times4\times4\times16\times64\times16\times2^4}\)=? ( số thập phân)
\(y=\frac{1\times2\times3+2\times4\times6+4\times8\times12+8\times16\times24}{2\times3\times4+4\times6\times8+8\times12\times16+16\times24\times32}\frac{ }{ }\)
\(y=\frac{1x2x3+2x4x6+4x8x12+8x16x24}{2x3x4+4x6x8+8x12x16+16x24x32}\)
\(y=\frac{1}{4}\)
tích nha . Đúng 100% luôn.
Tính biểu thức A bằng cách nhanh nhất
A :\(\frac{55}{11x16}+\frac{55}{16x21}+\frac{55}{21x26}+\frac{55}{26x31}+\frac{55}{31x36}+\frac{55}{36x41}\)
\(A=11\left(\frac{5}{11.6}+\frac{5}{16.21}+......+\frac{5}{36.41}\right)\)
\(=11\left(\frac{1}{11}-\frac{1}{16}+\frac{1}{16}-\frac{1}{21}+.....+\frac{1}{36}-\frac{1}{41}\right)\)
\(=11\left(\frac{1}{11}-\frac{1}{41}\right)\)
\(=11.\frac{30}{451}=\frac{30}{41}\)
Tính :
\(A=\frac{0,36\times1360+0,9\times4567\times4+3\times5130\times1,2}{1+4+7+10+......+52+55-514}\)
Tính (theo mẫu).
Mẫu: \(\dfrac{2\times3\times7}{5\times7\times3}=\dfrac{2}{5}\)
a) \(\dfrac{12\times11\times13}{13\times17\times11}\) b) \(\dfrac{49\times16\times31}{16\times49\times37}\)
a) = \(\dfrac{12}{17}\)
b) = \(\dfrac{31}{37}\)
\(\frac{49^{24}\times125^{10}\times2^8-5^{30}\times7^{49}\times4^5}{5^{29}\times16^2\times7^{48}}\) tính giùm mình nha
= (72)24 x (53)10 x 28- 530 x 749 x (22)5 / 529 x (24)2 x 748
= 748 x 530 x 28 - 530 x 749 x 210 / 529x 28 x 748
= 748 x 530 x 28 x (1 - 7 x 22) /529 x 28 x 748
=748 x 530 x 28 x (-27) / 529 x 28 x 748
=5 x (-27) = -135
=
Tính nhanh: \(\frac{864\times48-432\times96}{864\times48+432}\)
a)\(\frac{864.48-432.96}{864.48+432}\)
=\(\frac{864.48-432.2.48}{864.48+432}\)
=\(\frac{864.48-864.48}{864.48+432}\)
=\(\frac{0}{864.48+432}\)
=0
864x48-432x96/864x48+432=2x432x48-432x48x2/864x48+432=0/864x48+432=0.
**** mình nha
Bài 4: Tính nhanh:
a, A =\(\left(\frac{84}{13}\right)^2+\left(\frac{35}{13}\right)^2\)
b, B = \(\frac{12-\frac{12}{7}-\frac{12}{289}-\frac{12}{85}}{4-\frac{4}{7}-\frac{4}{289}-\frac{4}{85}}\div\frac{3+\frac{3}{13}+\frac{3}{169}+\frac{3}{91}}{7+\frac{7}{13}+\frac{7}{169}+\frac{7}{91}}\)
c, C =\(\frac{1\times2+2\times4+3\times6+4\times8+5\times10}{3\times4+6\times8+9\times12+12\times16+15\times20}\)