[toán 7] tính giá trị biểu thức

K

kool_boy_98

Giúp em nhé ^^~:

$A=(6- \frac{2}{3}+ \frac{1}{2})-(5+ \frac{5}{3}- \frac{3}{2})-(3- \frac{7}{3}+ \frac{5}{2})$

$A=6- \frac{2}{3}+ \frac{1}{2}- 5- \frac{5}{3} + \frac{3}{2}-3+ \frac{7}{3}- \frac{5}{2}$

$A=(6-5-3)+(\frac{7}{3}-\frac{2}{3}-\frac{5}{3})+(\frac{1}{2}+\frac{3}{2}-\frac{5}{2})$

$A=-2+0-\frac{1}{4}$

$A=\frac{-9}{4}$.
 
You must log in or register to reply here.
Top Bottom