3/4+6,8+0,25+0,5+1/5+1/2
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3/4+6,8+0,25+0,5+1/2+1/5=...............................................
ai là được bài này thì giỏi!
\(\frac{3}{4}+6,8+0,25+0,5+\frac{1}{2}+\frac{1}{5}=\left(\frac{3}{4}+0,25\right)+\left(6,8+\frac{1}{5}\right)+\left(0,5+\frac{1}{2}\right)\)
\(=\left(\frac{3}{4}+\frac{1}{4}\right)+\left(\frac{34}{5}+\frac{1}{5}\right)+\left(\frac{1}{2}+\frac{1}{2}\right)\)
\(=1+7+1=9\)
3/4 + 6,8 + 0,25 + 0,5 + 1/2 + 1/5
= 9
Chúc bn hok tốt
\(\left(6\dfrac{2}{5}+0,5\right):\dfrac{1}{4}+\dfrac{2}{5}\)
\(=\left(\dfrac{32}{5}+\dfrac{1}{2}\right):\dfrac{1}{4}+\dfrac{2}{5}\)
\(=\left(\dfrac{64}{10}+\dfrac{5}{10}\right)\times4+\dfrac{2}{5}\)
\(=\dfrac{69}{10}\times4+\dfrac{2}{5}\)
\(=\dfrac{276}{10}+\dfrac{2}{5}=\dfrac{138}{5}+\dfrac{2}{5}\)
\(=\dfrac{140}{5}=28\)
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\(32\times\dfrac{4}{5}+6,8\)
\(=32\times\dfrac{4}{5}+\dfrac{34}{5}\)
\(=\dfrac{128}{5}+\dfrac{34}{5}\)
\(=\dfrac{162}{5}\)
Câu 1.0,5+0,5=1
Câu 2.0,25+0,25=0,5
Câu 3.0,125+0,125=0,25
Câu 4.0,0625+0,0625=0,125
Câu 5.15,39+25,5=40,89
\(\dfrac{1}{2}:0,5-\dfrac{1}{4}:0,25+\dfrac{1}{5}:0,2-\dfrac{1}{8}:0,125\)
\(=\dfrac{1}{2}\times2-\dfrac{1}{4}\times4+\dfrac{1}{5}\times5-\dfrac{1}{8}\times8\)
\(=1-1+1-1=0\)
a) 11 : 4 + 5,3 x 3,8
= 3,75 + 5,3 x 3,8
= 3,75 + 20,14
= 23,89
b) 16,52 : 0,5 - 2,7 : 0.25
= 33,04 - 2,7 : 0,25
= 33,04 - 10,8
= 22,24
c) 7/5 : 2/3 : 1,05 - 4/9
= 7/5 : 2/3 : 21/20 - 4/9
= 7/5 x 3/2 x 20/21 - 4/9
= (1 x 3 x 2)/ (1 x 1 x 3)
= 6/3
= 2
1) 2,75 - 5/6 × 2/5 = 2,75 - (5/6) × (2/5) = 2,75 - 1/3 = 2,75 - 0,33 = 2,42
2) 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 0,75) - 3/5 = 1,25 - (5/6 - 3/4) - 3/5 = 1,25 - (5/6 - 9/12) - 3/5 = 1,25 - (10/12 - 9/12) - 3/5 = 1,25 - 1/12 - 3/5 = 1,25 - 0,08 - 0,6 = 1,25 - 0,68 = 0,57
3) 4/9 × 0,75 + 8/5 + 3,125 = (4/9) × 0,75 + 8/5 + 3,125 = 0,44 + 8/5 + 3,125 = 0,44 + 1,6 + 3,125 = 0,44 + 4,725 = 5,165
4) 1,125 - 4/7 - 0,12 = 1,125 - (4/7) - 0,12 = 1,125 - 0,57 - 0,12 = 0,435 - 0,12 = 0,315
5) (1/3 + 0,4) × 3,5 + (1/6 + 0,75) × 6/5
\(\frac{3}{4}+6,8+0,25+0,5+\frac{1}{5}+\frac{1}{2}\)
\(=0,75+6,8+0,25+0,5+0,2+0,5\)
\(=\left(0,75+0,25\right)+\left(6,8+0,2\right)+\left(0,5+0,5\right)\)
\(=1+7+1\)
\(=9\)
3/4+6.8+0.25+0.5+1/5+1/2 =9