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a) 0,4 * 0,75 - 0,3 = 0
b) 1 3/4 - 13/20 = 1 2/20 = 1 1/10
b) 1,75 - 0,65 = 1,10
c) 2 1/5 + 2 4/5 = 5
c) 2,2 + 2,8 = 5
d) 3 1/2 : 1/4 = 7/2 :4/1 = 14
d) 3,5 : 0,25 = 350 : 25 = 14
e)( 2 1/2 - 1/2) : 4 = 2:4 = 1/2
e) (2,5 - 0,5) : 4 = 2:4 =0,5
f) ( 2 7/8 + 1/8) * 3 2/25 = 3/1 * 77/25 = 9 24/25
f) ( 2,875 + 0,125) * 3,08 = 3*3,08=9,24
g) ( 3 4/5 * 1/2 ) + ( 2 1/20 : 2 ) = 1 9/10 + 1 1/40 = 2 37/40
g) ( 3,8 * 0,5) + (2,05 : 2) = 1,9 + 1,025 = 3,015