Sửa đề: \(P=\dfrac{0.75-0.6+\dfrac{3}{7}+\dfrac{3}{13}}{2.75-2.2+\dfrac{11}{7}+\dfrac{11}{13}}\)
\(=\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{13}}{\dfrac{11}{4}-\dfrac{11}{5}+\dfrac{11}{7}+\dfrac{11}{13}}=\dfrac{3}{11}\)
A= 0,75-0,6+3/7+3/13 / 2,75-2,2+11/7=11/13
gia tri cua bieu thuc : B=\(\dfrac{-1:1\dfrac{1}{15}}{3\dfrac{1}{8}:6\dfrac{2}{3}}\): \(\dfrac{4\dfrac{7}{8}:13}{5:1\dfrac{7}{8}}\): \(\dfrac{1}{3^2}\)
tinh gia tri bieu thuc cua dai so x2y3 +xy tai x=1 va y=1/2
tinh gia tri bieu thuc ;
B=\(\dfrac{4^6.9^5+6^9.120}{-8^4.3^{12}-6^{11}}\)
tinh gia tri bieu thuc tai x=1 y=-1 z=3
xyz+2x^2y/y^2+1
tinh gí tri bieu thuc:
D=\(\dfrac{4^6.9^5+6^9.120}{-8^4.3^{12}-6^{11}}\)
Tim gia tri nho nhat cua bieu thuc : A=\(\dfrac{21\left|4x+6\right|+33}{3\left|4x+6\right|+5}\)
Tinh gia tri bieu thuc : (3.2^20+7.2^19).52/(13.8^4)^2
B1
(-1/2)-(-3/5)+(-1/9)+1/131-(-2/7)+4/35-7/18
B2
A=1/3-3/5+5/7-7/9+9/11-11/13+13/15+11/13-9/11+7/9-5/7+3/5-1/3
B=1/99-1/99.98-1/98.97-1/97.96-...-1/3.2-1/2.1
\(\dfrac{\dfrac{3}{4}-\dfrac{3}{5}+\dfrac{3}{7}+\dfrac{3}{11}}{\dfrac{13}{4}-\dfrac{13}{5}+\dfrac{13}{7}+\dfrac{13}{11}}\)
