Tính hợp lí:
\(-(\dfrac35+\dfrac34)-(-\dfrac34+\dfrac25)\)
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\(\dfrac23 +\) (\(\dfrac34 + \dfrac12\) ) = (\(...+\dfrac34\))
tính thuận tiện :
\(\dfrac16+\dfrac35 + \dfrac{11}6 + \dfrac25 + \dfrac{18}6\)
\(\dfrac{1}{6}+\dfrac{3}{5}+\dfrac{11}{6}+\dfrac{2}{5}+\dfrac{18}{6}\)
\(=\left(\dfrac{1}{6}+\dfrac{11}{6}+\dfrac{18}{6}\right)+\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\)
\(=5+1\)
\(=6\)
hình bình hành có độ dài đáy \(\dfrac23\), chiều cao \(\dfrac34\), diện tích là :
chỉ cần Đ/S :
\(\dfrac{12}{25} + \dfrac35 + \dfrac{12}{25}\)=..
tính thuận tiện
\(=\dfrac{12}{25}+\dfrac{15}{25}+\dfrac{12}{25}=\left(\dfrac{12}{25}+\dfrac{12}{25}\right)+\dfrac{15}{25}=\dfrac{24}{25}+\dfrac{15}{25}=\dfrac{39}{25}\)
\(\dfrac25 + 3 =\)
\(\dfrac58 X \dfrac25\)
Tìm x biết:
a.\(\dfrac45\)-x=\(\dfrac13 \)
b.1\(\dfrac34\).x+1\(\dfrac12\)=-\(\dfrac45\)
c.(5x-1)(2x-\(\dfrac 13\))=0
d.\(\left|x-19\right|\)=20
e.\(\left|\frac{1}{2}x+0,25\right|\)=\(3\frac{3}{4}\)
f.\(\left|x-1,5\right|+\left|2,5-x\right|=0\)
g.\(\frac{x-4}{2017}+\frac{x-3}{2018}=\frac{x-2}{2019}+\frac{x-1}{2020}\)
\(\dfrac35 : \dfrac74\)
\(1 + 1 \)
\(\dfrac{3}{5}\times\dfrac{4}{7}=\dfrac{12}{35}\)
\(1+1=2\)