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95+67+5+33+82+39+18+61
=(95+5)+(67+33)+(82+18)+(39+61)
= 100 +100 +100 +100
=100x4
=400
chúc bn học giỏi nha
a) 57 + 28 = 85
24 + 67 = 91
46 + 39 = 85
b) 83 - 19 = 64
42 - 38 = 4
90 - 76 = 14
\(\begin{array}{*{20}{c}}{a)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{57}\\{28}\end{array}}\\\hline{\,\,\,\,85}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{24}\\{67}\end{array}}\\\hline{\,\,\,\,91}\end{array}\) \(\begin{array}{*{20}{c}}{ + \begin{array}{*{20}{c}}{46}\\{39}\end{array}}\\\hline{\,\,\,\,85}\end{array}\)
\(\begin{array}{*{20}{c}}{b)\,\,}\\{}\\{}\end{array}\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{83}\\{19}\end{array}}\\\hline{\,\,\,\,64}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{42}\\{38}\end{array}}\\\hline{\,\,\,\,04}\end{array}\) \(\begin{array}{*{20}{c}}{ - \begin{array}{*{20}{c}}{90}\\{76}\end{array}}\\\hline{\,\,\,\,14}\end{array}\)
1+88+99+12+33+67+44+56+100
=(1+99)+(88+12)+(33+67)+(44+56)+100
=100+100+100+100+100
=100x5
=500
\(\left|\frac{3}{2}x-1\right|-\left|x+\frac{3}{2}\right|=0\)
Ta có :
\(\left|\frac{3}{2}x-1\right|-\left|x+\frac{3}{2}\right|\ge\left|\frac{3x}{2}-1-x-\frac{3}{2}\right|=\left|\frac{x-5}{2}\right|\)
Tự làm nốt
Ta có: \(\left|\frac{3}{2}x-1\right|-\left|x+\frac{3}{2}\right|=0\)
\(\Leftrightarrow\left|\frac{3}{2}x-1\right|=\left|x+\frac{3}{2}\right|\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{3}{2}x-1=x+\frac{3}{2}\\\frac{3}{2}x-1=-x-\frac{3}{2}\end{cases}}\)
\(\Leftrightarrow\orbr{\begin{cases}\frac{1}{2}x=\frac{5}{2}\\\frac{5}{2}x=-\frac{1}{2}\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=5\\x=-\frac{1}{5}\end{cases}}\)
17+33+87+67=50+87+67=137+67=204
17+33+87+67=(17+83)+(33+63)
=100+100
=200
k nha