tinh nhanh
a) 16x4+16x5+16
b) 9x25+9x25+9x50
9x25+9x25+9x50
tính nhanh :3/11x7/19+17/11x3/19-3/9x25/11
tính nhanh : 3/11x7/19+17/11x3/19-3/9x25/11
tính (5/9x13+7/9x25+13/19x25+31/319x69):(1/13-1/69)
(112/13x20)+(112/20x27)+...+(112/62x69):(-5/9.13-7/9x25-13/19x25-31/19x69)
(112/13x20)+(112/20x27)+...+(112/62x69):(-5/9.13-7/9x25-13/19x25-31/19x69)
số tự nhiên X thỏa mãn 3 mũ x nhân 5 mũ x = 9x25 là x =
Tính bằng cách thuận tiện nhất
9x8x33/56x54x11
8x15+16x4-8x21 / 16x5-8x9
\(\frac{9\cdot8\cdot33}{56\cdot54\cdot11}=\frac{9\cdot8\cdot3\cdot11}{8\cdot7\cdot9\cdot3\cdot2\cdot11}=\frac{1}{7\cdot2}=\frac{1}{14}\)
\(\frac{8\cdot15+16\cdot4-8\cdot21}{16\cdot5-8\cdot9}=\frac{8\cdot15+8\cdot2\cdot4-8\cdot21}{2\cdot8\cdot5-8\cdot9}=\frac{8\cdot15+8\cdot8-8\cdot21}{8\cdot10-8\cdot9}=\frac{8\left(15+8-21\right)}{8\left(10-9\right)}=\frac{8\cdot2}{8\cdot1}=\frac{2}{1}=2\)
Tính : \(\frac{8x15+16x4-8x21}{16x5-8x7}\)
\(x\)là dấu nhân
\(\frac{8x15+16x4-8x21}{16x5-8x7}\)
\(\Rightarrow=\frac{120+64-168}{80-56}=\frac{16}{24}=\frac{2}{3}\)
Ủng hộ đi nhen
\(\frac{8\times25+16\times4-8\times21}{16\times5-8\times7}\)
\(\Rightarrow\frac{120+64-168}{80-56}\)
\(\Rightarrow\frac{16}{24}=\frac{2}{3}\)
\(\frac{8.15+16.4-8.21}{16.5-8.7}\)
\(=\frac{120+64-168}{80-56}\)
\(=\frac{16}{24}\)
\(=\frac{2}{3}\)
tương tác tốt