\(\left(7^{19}\cdot3+7^{19}\cdot4\right):7^{18}\)
\(=\left[7^{19}\cdot\left(4+3\right)\right]:7^{18}\)
\(=\left(7^{19}\cdot7\right):7^{18}\)
\(=7^{20}:7^{18}\)
\(=7^{20-18}\)
\(=7^2\)
\(=49\)
A=7/19.8/11+7/19.3/11+12/19
1) Tính nhanh
a) 7/19. 8/11 + 7/19.3/11 + 12/19
1) Tính nhanh
a) 7/19. 8/11 + 7/19.3/11 + 12/19
/ là phần
B=5/9.8/11+7/19.3/11+12/19
a,(-25) .125.4.(-8) .(-17)
b,-3\4+2\7+-1\4+3\5+5\7
c,7\19.8\11+7\19.3\11-12\19
d,19 5\8:7\2013-26 5\8:7\2013
e,-5\12.2\11+-5\12.9\11+5\12
TTính biểu thức sau một cách hợp lí
A=7/19 .8/11+7/19.3/11+12/19
B=5/9.7/13+5/9.9/13-5/9.3/13
Ai làm nhanh mình Tick cho 3 cái
-17.(-3)-(x+29)=-11-3x
15-2x=-11-3x
-17-4x=-19.3-2x
46-(52-x)=12.(-7)+2x
tìm x:
\(\dfrac{x-}{7-}\dfrac{\dfrac{x}{12}+}{\dfrac{7}{12}}\dfrac{\dfrac{x}{18}}{\dfrac{7}{18}}=\dfrac{-4}{7}\)
