Rút gọn rồi tính: 146 , 5 2 - 109 , 5 2 + 27 . 256
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\(\frac{3}{5}-\frac{5}{35}=\frac{21}{35}-\frac{5}{35}=\frac{16}{35}\)
\(\frac{18}{27}-\frac{2}{6}=\frac{1}{3}\)
\(\frac{15}{25}-\frac{3}{21}=\frac{16}{35}\)
\(\frac{24}{36}-\frac{6}{12}=\frac{1}{6}\)
tích đúng cho mk nhé
35−535=2135−535=163535−535=2135−535=1635
1827−26=131827−26=13
1525−321=16351525−321=1635
2436−612=16
\(\frac{5}{7}-\frac{4}{17}=\frac{5}{7}-\frac{2}{8,5}=\frac{42,5}{59,5}-\frac{14}{59,5}=\frac{38,5}{59,5}\)
\(\frac{21}{27}-\frac{2}{9}=\frac{7}{9}-\frac{2}{9}=\frac{5}{9}\)
\(\frac{13}{5}-\frac{35}{25}=\frac{13}{5}-\frac{7}{5}=\frac{6}{5}\)
a)(x-10)2-x(x+80)
(x2-2x10+100)-x2-80x
=x2-20x+100-x2-80x=-100x+100
khi x = 0.98
ta có
(-100*0.98)+100=-98+100=2
b)x3-9x+27x-27
hình như là -27x :))
\(\dfrac{3}{12}+\dfrac{1}{4}=\dfrac{3:3}{12:3}+\dfrac{1}{4}=\dfrac{1}{4}+\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)
\(\dfrac{4}{10}+\dfrac{3}{5}=\dfrac{4:2}{10:2}+\dfrac{3}{5}=\dfrac{2}{5}+\dfrac{3}{5}=\dfrac{5}{5}=1\)
\(\dfrac{12}{27}+\dfrac{2}{9}=\dfrac{12:3}{27:3}+\dfrac{2}{9}=\dfrac{4}{9}+\dfrac{2}{9}=\dfrac{6}{9}=\dfrac{2}{3}\)
\(\dfrac{7}{3}+\dfrac{20}{15}=\dfrac{7}{3}+\dfrac{20:5}{15:5}=\dfrac{7}{3}+\dfrac{4}{3}=\dfrac{11}{3}\)
a: =8/5-2/3=24/15-10/15=14/15
12/20-6/18=3/5-1/3=9/15-5/15=4/15
b: 18/21-12/27=6/7-7/9=54/63-49/63=5/63
8/12-20/50=2/3-2/5=10/15-6/15=4/15
\(a,\dfrac{8}{5}-\dfrac{18}{27}=\dfrac{8}{5}-\dfrac{2}{3}=\dfrac{14}{15}\\ \dfrac{12}{20}-\dfrac{6}{18}=\dfrac{3}{5}-\dfrac{1}{3}=\dfrac{4}{15}\\ b,\dfrac{18}{21}-\dfrac{12}{27}=\dfrac{6}{7}-\dfrac{4}{9}=\dfrac{26}{63}\\ \dfrac{8}{12}-\dfrac{20}{50}=\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{4}{15}\)
\(a,=\left(2x-7\right)^2=\left(2.4-7\right)^2=1\)
\(b,\left(x-3\right)^3=\left(5-3\right)^3=8\)
a: =1/4+1/4=2/4=1/2
b: =3/5+3/5=6/5
c: =5/9+7/9=12/9=4/3
a) 3/5 + 2/5 = 5/5 = 1
b) 4/6 =2/3 ; 18/27 = 2/3
2/3 + 2/3 = 4/3
c) mình ko biết làm
a) \(\frac{3}{5}+\frac{2}{5}=\frac{3+2}{5}=\frac{5}{5}=1\)
b)\(\frac{4}{6}=\frac{2}{3}\)
\(\frac{18}{27}=\frac{2}{3}\)
\(\frac{2}{3}+\frac{2}{3}=\frac{2+2}{3}=\frac{4}{3}\)
c)\(\frac{15}{25}=\frac{3}{5}\)
\(\frac{6}{21}=\frac{2}{7}\)
\(\frac{3}{5}+\frac{2}{7}=\frac{21}{35}+\frac{10}{35}=\frac{21+10}{35}=\frac{31}{35}\)