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Tính nhanh B= 1/5 -3/7 +5/9 -2/11+7/13-9/16-7/13+2/11-5/9+3/7 -1/5
Tính nhanh:
B = 1/5 - 3/7 + 5/9 - 2/11 + 7/13 - 9/16 -7/13 + 2/11 - 5/9 + 3/7 - 1/5
tinh nhanh B=1/5-3/7+5/9-2/11+7/13-9/16-7/13+2/11-5/9+3/7-1/5
Tính nhanh:
\(B=\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)
B=1/5-3/7+5/9-2/11+7/13-9/16-7/13+2/11-5/9+3/7-1/5
tính nhanh :
A = 1/3 - 3/4 -(-3/5) +1/72-2/9-1/36+1/15
B= 1/5 -3/7 +5/9 -2/11+7/13-9/16-7/13+2/11-5/9+3/7 -1/5
C= 1/100-1/100.99- 1/99.98-1/98.97......-1/3.2 - 1.2.1
Tính nhanh
\(B=\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)
Tính nhanh
B=\(\frac{1}{5}-\frac{3}{7}+\frac{5}{9}-\frac{2}{11}+\frac{7}{13}-\frac{9}{16}-\frac{7}{13}+\frac{2}{11}-\frac{5}{9}+\frac{3}{7}-\frac{1}{5}\)
a,1/3 -3/4 - (-3/5) + 1/72-2/9-1/36 +1/15
b, 1/5 - 3/7 + 5/9 -1/11 + 7/13 - 9/16 - 7/13 + 2/11 -5/9 + 3/7 -1/5
help me pls
B = 1/5 - 3/7 + 5/9 - 2/11 + 7/13 - 9/16 - 7/13 + 2/11 - 5/9 + 3/7 - 1/5
nhớ làm cẩn thận nha