a) 0,3 * (2/5 - 1/3 ) = 0,3 * 1/15 = 3/10*1/15 = 3 /150 = 1/50b) 2 ,25 + 5/7 * 1,4 - 1/2 = 1,75 + 5/7 * 14/10 = 1,75 + 1 = 2,75c) (21,75-71/4) * 4 = 4*4=16d) 18*0,02+6,4:10= 0,36 + 6,4:10=0,36+0,64= 1e) 2,3 : 10 - 2,3 : 10 - 2,3 * 1/10 = 0,23 - 0,23 - 2,3*1/10 = 0-2,3*1/10= 0-0,23f) 8,35:0,1 - 0,1 : 2/5 = 83,5 - 0,25= 83 , 25g) (2 2/3 - 0,6 ) * 0,25 - 1/4 = (8/3 – 6/10) * ¼ - ¼ = (80/30 – 18/30) * ¼ - ¼ = 62/30 * ¼ - ¼ = 31/15 * ¼ - 15/60 = 31/60 – 15/60 = 16/60 = 4/15
h) 3 3/5 - 3/5 + 2 1/3 = 3 + 2 1/3 = 5 1/3i ) 5 * 12+8/5 +8 = 60 + 8/5 +8 = 69 3/5
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a) 0,3 * (2/5 - 1/3 ) = 0,3 * 1/15 = 3/10*1/15 = 3 /150 = 1/50
b) 2 ,25 + 5/7 * 1,4 - 1/2 = 1,75 + 5/7 * 14/10 = 1,75 + 1 = 2,75
c) (21,75-71/4) * 4 = 4*4=16
d) 18*0,02+6,4:10= 0,36 + 6,4:10=0,36+0,64= 1
e) 2,3 : 10 - 2,3 : 10 - 2,3 * 1/10 = 0,23 - 0,23 - 2,3*1/10 = 0-2,3*1/10= 0-0,23
f) 8,35:0,1 - 0,1 : 2/5 = 83,5 - 0,25= 83 , 25
g) (2 2/3 - 0,6 ) * 0,25 - 1/4 = (8/3 – 6/10) * ¼ - ¼ = (80/30 – 18/30) * ¼ - ¼ = 62/30 * ¼ - ¼ = 31/15 * ¼ - 15/60 = 31/60 – 15/60 = 16/60 = 4/15
h) 3 3/5 - 3/5 + 2 1/3 = 3 + 2 1/3 = 5 1/3
i ) 5 * 12+8/5 +8 = 60 + 8/5 +8 = 69 3/5