Các câu hỏi tương tự
tính
2,\(A=\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
3,\(B=\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}.\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}+\frac{6}{7}\)
Biết 13+23+33+...+103= 3025
Tính A= (0,5)3+13+(1,5)3+...+53
B= (0,25)3+(0,5)3+(0,75)3+...+(2,5)3
1) ( 0,25 - x ) : -3/5 = -3/4
2) -3/8x - 0,75 = -1 1/2
3) 3/5x + 2/3 = 2 2/3
Cho biết
\(1^{2+2^2+3^2+.......+10^2=385}\)
Tính tổng:
a)\(^{2^2+4^2+6^2+........+20^2}\)
b)\(\left(0,25\right)^2+\left(0,5\right)^2+...........+\left(2,5\right)^2\)
Tim x, biet:
a/ \(3,8:\left(2.x\right)=\frac{1}{4}:2\frac{2}{3}\)
b/ \(\left(0,25.x\right):3=\frac{5}{6}:0,125\)
c/ \(0,01:2,5=\left(0,75.x\right):0,75\)
d/ \(1\frac{1}{3}:0,8=\frac{2}{3}:\left(0,1.x\right)\)
tính b
b=\(\frac{0,275-0,5+\frac{3}{11}}{0,625+0,5+\frac{5}{11}}:\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
So sánh
A=\(\frac{1}{3}+\frac{1}{3^2}+\frac{1}{3^9}+.....+\frac{1}{3^{33}}với\frac{1}{2}\)
(2/3-0,25+2)-(2-5/2+1/4)-(2,5-1/3) giúp mk vs
tính
(-0,75)-(-1+2/3):0,5+(-1/4)
|(-3/2)+2/3)mũ 2 x24/25-1/5
lời giải đầy đủ
Tính:1)A=\(\frac{0,375-0,3+\frac{3}{11}+\frac{3}{12}}{-0,625+0,5-\frac{5}{11}-\frac{5}{12}}+\frac{1,5+1-0,75}{2,5+\frac{5}{3}-1,25}\)
B=\(\frac{\frac{1}{3}-\frac{1}{7}-\frac{1}{13}}{\frac{2}{3}-\frac{2}{7}-\frac{2}{13}}\times\frac{\frac{1}{3}-0,25+0,2}{1\frac{1}{6}-0,875+0,7}+\frac{6}{7}\)