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35 x 12 - 15 x 28 + \(\frac{23}{49}\)- \(\frac{23}{49}\)+ 2017
= 35 x 12 - 15 x 28 + 0 + 2017
= 35 x 12 - 15 x 28 + 2017
= 420 - 420 + 2017
= 0 + 2017
= 2017
Câu này dễ mà
\(=35.12-15.28+\frac{23}{49}-\frac{23}{49}+2010\)
\(=\left(420-420\right)+\left(\frac{23}{49}-\frac{23}{49}\right)+2010\)
\(=0+0+2010\)
\(=2010\)
Ta có:
=35x12-15x28+23/49-23/49+2010
=420-420+0+2010
=0+2010
=2010
chúc bạn học tốt
miru
Rút gọn rồi tính:
\(\frac{28}{35}.\frac{15}{72}.1\frac{7}{49}\)
\(=\frac{4}{5}.\frac{5}{24}.\frac{56}{49}\)
\(=\frac{4.5.8}{5.24.7}=\frac{4}{21}\)
\(\dfrac{19}{28}+\dfrac{23}{47}-\dfrac{15}{8}+\dfrac{9}{28}+\dfrac{24}{47}\)
\(=\left(\dfrac{19}{28}+\dfrac{9}{28}\right)+\left(\dfrac{23}{47}+\dfrac{24}{47}\right)-\dfrac{15}{8}\)
\(=\dfrac{28}{28}+\dfrac{47}{47}-\dfrac{15}{8}\)
\(=1+1-\dfrac{15}{8}\)
\(=\dfrac{1}{8}\)
____________________
\(\dfrac{30}{11}+\dfrac{12}{35}-\dfrac{19}{11}-\dfrac{2}{35}-\dfrac{2}{7}\)
\(=\left(\dfrac{30}{11}-\dfrac{19}{11}\right)+\left(\dfrac{12}{35}-\dfrac{2}{35}\right)-\dfrac{2}{7}\)
\(=\dfrac{11}{11}+\dfrac{10}{35}-\dfrac{2}{7}\)
\(=1+\dfrac{2}{7}-\dfrac{2}{7}\)
\(=1\)
đổi 25% =0,25
=0,25x0.8+0,6-0.8+2010
=0,2+0,6-0,8+2010
=0.8-0,8+2010
=0+2010
=2010
25%.4/5+3/5-0,8+2010
= 0,25.0,8-0,8+2010
=0,2+2010,8
=2011
dấu chấm là dấu nhân nha bạn
35 x 12 - 15 x 28 + \(\frac{2323}{4949}-\frac{23}{49}\)+ 2010
= (420 - 420 )+ \(\left(\frac{23}{49}-\frac{23}{49}\right)\)+ 2010
= 0 + 0 + 2010 = 2010 .
35 x 12 -15 x28+2323/4949-23/49+2010
=35x12-15x28+23/49-23/49+2010
=420-420+0+2010
=0+0+2010
=2010