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2/3*1 4/5 = 2/3*9/5 = 18/15 = 1 3/15 = 1 1/5 = 1,2
Zad.3
3/8x = 7 1/2
3/8x = 15/2 / :3/8
x = 20
Zad. 5.
a) 5 1/3 - 2,1 = 5⅓ - 2 ¹/₁₀ = 5 10/30-2 3/30 = 3 7/30
b)0,5 : 1/4 - 3,2 = 0,5:0,25-3,2 = 2-3,2 = -1,2
c)15,8 - 4 1/6 * 0,3 = 15,8-25/6*3/10 = 15,8-5/4 = 15,8-1,25 = 14,55
d)17,2 - 4 1/7 * 0,25 = 17,2-29/7*1/4 = 17,2-29/28 = 172/10-29/28 = 2408/140-145/140 = 2263/140 = 16 23/140
e)1/3 * 5,1 + 3 : 1/9 = 1/3*51/10+27 = 51/30+27 = 1,7+27 = 28,7
f)21,7 * 1/7 - 3/7 * 0,5 * 1/6 = 217/10*1/7-3/7*1/2*1/6 = 3,1-1/14 = 31/10-1/14 = 434/140-10/140 = 424/140 = 3 4/140 = 3 1/35