30 x 30 =?
Chọn các đáp án đúng:
(600 : 30) : 5 = 600 : (30 : 5)
(600 + 30) + 5 = 600 + (30 + 5)
(600 - 30) - 5 = 600 - (30 - 5)
(600 x 30) x 5 = 600 x (30 x 5)
Các đáp án nha.
Đáp án đúng là:
(600 + 30) + 5 = 600 + (30 + 5)
(600 x30) x 5 = 600 x ( 30 x 5)
(600 x 30) x 5 = 600 x (30 x 5)
(600 + 30) + 5 = 600 +(30 + 5)
Kích thước hố loại 2 làm đất trồng cây (chiều dài x chiều rộng x chiều sâu) là: A. 30 x 30 x 30 cm B. 30 x 40 x 30 cm C. 40 x 40 x 40 cm D. 40 x 40 x 30 cm
30+30-30+30 x 30
30 + 30 x 20 + 30 x 10 = ?
30 + 30 * 20 + 30 * 10
= 30 * 1 + 30 * 20 + 30 * 10
= 30 * ( 1 + 20 + 10 )
= 30 * 31
= 930
30 + 30 x20 + 30 x 10
= 30 x 1 + 30 x 20 + 30 x 10
= 30 x ( 1 + 20 + 10 )
= 30 x 31
= 930
****nha
30 + 30 * 20 + 30 * 10
= 30 * 1 + 30 * 20 + 30 * 10
= 30 * ( 1 + 20 + 10 )
= 30 * 31
= 930
5 + 5 x 6 - 30 + 30 x 30 =
5+5*6-30+30*30
=5+30-30+900
=905
5 + 5 x 6 - 30 + 30 x 30 = 5 + 30 - 30 + 900 = 905
30 x 2 + 30 x 5 + 30 x 3
30 x 2 + 30 x 5 + 30 x 3
= 30 x ( 2 + 5 + 3 )
= 30 x 10
= 300
30 x 2+ 30 x 5 +30 x3
30x[2+5+3]
30x 10
300
Tìm X: \(\dfrac{30-x}{30}=\dfrac{8}{15};\dfrac{x+30}{72}=\dfrac{5}{8}\)
\(\dfrac{30-x}{30}=\dfrac{8}{15}\)
\(\Rightarrow\left(30-x\right)15=30\times8\)
\(\Rightarrow\left(30-x\right)15=240\)
\(\Rightarrow30-x=240:15\)
\(\Rightarrow30-x=16\)
\(\Rightarrow x=30-16\)
\(\Rightarrow x=14\)
__
\(\dfrac{x+30}{72}=\dfrac{5}{8}\)
\(\Rightarrow\left(x+30\right)8=5\times72\)
\(\Rightarrow\left(x+30\right)8=360\)
\(\Rightarrow x+30=360:8\)
\(\Rightarrow x+30=45\)
\(\Rightarrow x=45-30\)
\(\Rightarrow x=15\)
\(\dfrac{30-x}{30}=\dfrac{5}{15};\dfrac{x+30}{72}=\dfrac{5}{8}\)
\(\dfrac{30-x}{30}\) = \(\dfrac{5}{15}\)
\(\dfrac{30-x}{30}\) = \(\dfrac{1}{3}\)
30 - \(x\) = \(\dfrac{1}{3}\) \(\times\) 30
30 - \(x\) = 10
\(x\) =30 - 10
\(x\) = 20
\(\dfrac{x+30}{72}\) = \(\dfrac{5}{8}\)
\(x+30\) = \(\dfrac{5}{8}\) \(\times\) 72
\(x+30\) = 45
\(x\) = 45 - 30
\(x\) = 15
f(x)=x^2/1-2x+2 x^2 tính a=f(1/30)+f(2/30)+..+f(29/30
Tính A=(\(\sqrt{x-\sqrt{30}}-\sqrt{x+\sqrt{30}}\))\(\sqrt{x+\sqrt{x^2-30}}\)với x lớn hơn hoặc bằng \(\sqrt{30}\)