1)(-1/2)^2:1/4-2.(-1/2)^3+căn 4

=1/4:1/4-2.-1/8+2

= 1-(-1/4)+2

=1+1/4+2=13/4

2) 3-(-6/7)^0+căn 9 :2

= 3-1+3:2

=3-1+3/2=7/2

3) (-2)^3+1/2:1/8-căn 25 + |-64|

= -8+4-5+64= 55

4) (-1/2)^4+|-2/3|-2007^0

= 1/16+2/3-1

= -13/48

5) = 178/495:623/495-17/60:119/120

= 2/7-2/7=0

6) [2^3.(-1/2)^3+1/2]+[25/22+6/25-3/22+19/25+1/2]

= [-1+1/2]+[(25/22-3/22)+(6/25+19/25)+1/2]

= -1/2+[1+1+1/2]

= -1/2+5/2=2

Mấy cái dấu chấm đó là  nhân nha bn!

c)-(2/7+1/3-5/6)-(-9/7+14/7-1/5+5/3)

= -(-3/14)-229/105

= 3/14-229/105

= -59/30

a)[(-32,47)+68,12]+32,47

= [(-32,47)+32,47]+68,12

= 0+68,12

= 68,12

b) [(-61,8)+(-123,6]+[83,6+61,8]

= [(-61,8)+61,8]+[(-123,6)+83,6]

=0+(-40)

=-40