Question

Oblicz
a) 2/5+0,77=

b) 15,4+ 3 1/3=

c) 8 3/4 + 1,125=
d)1,75- 5/6=

e) 3 1/5-2,25=
f)6,8- 5 1/4=

g) 6,4 x 5/8=
h) 2/15 x 0,75=
i) 1 3/7 x 0,056=
j) 2,4: 1 3/5=

k) 3 3/4:0,05=

l) 2 5/6: 3,4=

Answer 1

A) 2/5+0,77=0,4 + 0,77 = 1,17
b) 15,4 + 3i1/3 = 15 i4/10 +3 i1/3 = 15 i12/30 + 3 i10/30= 18 i 22/30=18 i 11/15
c) 8 i3/4 +1,125 = 8,75 +1,125 = 7,875
d) 1,75 - 5/6 = 1 i3/4 -5/6= 1 i9/12 - 10/12 = 21/12 - 10/12 = 11/12
e) 3 i1/5 - 2,25 = 3,2 - 2,25 = 0,95
f) 6,8 -5 i1/4 = 6,8 - 5,25 = 1,55
g) 6,4* 5/8 = 6,4 * 0,625 = 4    
h) 2/15 * 0,75 = 2/15 * 3/4 = 1/5 *1/2 = 1/10
i) 1 i3/7 *0,056 = 10/7 *56/1000 =  1/1 * 8/100 = 8/100
j) 2,4 : 1 i3/5 = 24/10 : 8/5 = 24/10 * 5/8 = 3/2 * 1/1 = 3/2 = 1 i1/2    
k) 3 i3/4 : 0,5 = 3,75 : 0,5 = 7,5
l) 2 i 5/6 : 3,4 = 17/6 : 34/10= 17/6 * 10/34 = 1/3 * 5/2 = 5/6