Question

1:tinh nhanh.

A:6,3+(-3,7)+2,4+(-0,3)             B:(-4,9)+5,5+4,9+(-5,5)             C:2,9+3,7+(-4,2)+(-2,9)+4,2        D:(-6,5).2,8+2,8.(-3,5)

Answer 1

a/ = 6.3 + 2.4 - 4 = 8.7 - 4 = 4.7

b/ = ( -4.9 + 4.9 ) + ( 5.5 + (-5.5) ) = 0 + 0 = 0

c/ = ( -2.9 + 2.9 ) + ( -4.2 + 4.2 ) + 3.7 = 0 + 3.7 = 3.7

d/ = 2.8 ( -6.5 + -3.5 ) = 2.8 x ( -10 ) = -28

Answer 2

 a) 6,3 + (-3,7) + 2,4 + (-0,3) = (6,3 + 2,4) + ((-3,7) + (-0,3)) = 8,7 + (-4) = 4,7

b) (-4,9) + 5,5 + 4,9 + (-5,5) = ((-4,9) + 4,9) + ( 5,5 + (-5,5)) = 0 + 0 = 0

c) 2,9 + 3,7 + (-4,2) + (-2,9) + 4,2 = (2,9 + (-2,9)) + ((-4,2) + 4,2) + 3,7 = 3,7

d) (-6,5).2,8 + 2,8.(-3,5) = 2,8.( (-6,5) + (-3,5)) = 2,8. ( -10) = -28