całe zadanie
a) 2/5+0,3+(0,8-1/2)=4/10+3/10+0,3=7/10+3/10=1
b) 0,9 : 1/5 + 1/3 -3/5=4,5+1/3 - 3/5=45/10 + 1/3 - 3/5= 135/30+ 10/30 -18/30=145/30- 18/30=127/30=4 7/30
c) (1 : 0,3 -2 1/3)- 5/6=(9/30 - 2 10/30) - 5/6= - 2 1/30 - 5/6= - 2 1/30 - 25/30= - 2 26/30= - 2 13/15
d)2 1/7 * 1,6 *2 1/3=15/7 *8/5 * 7/3=8
e)2 6/11: 7/11:3,4=28/11 : 7/11: 17/5=28/11 *11/7 * 5/17=20/17=1 3/17
f)6 2/3 * (0,25 + 1/5)=6 2/3 *(1/4+ 1/5)= 6 2/3 *(5/20 + 4/20)=21/3 * 9/20=63/20=3 3/20
g) 1 5/9 :1 1/3 * 0,75=14/9 *3/4 * 3/4=7/8
h)3 1/3 - 1/3 * 0,6=3 * 0,6=1,8
i) 3 4/9 - 1 2/3 * 1,8=3 4/9 - 1 6/9 * 1,8=1 7/9 * 1,8= 16/9 *9/5= 16/5=3 1/5
j)4,5 * 5 5/9 +6,4 * 3/8=9/2 * 50/9 + 32/5 * 3/8=25 + 2 2/5= 27 2/5
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a) 2/5+0,3+(0,8-1/2)=4/10+3/10+0,3=7/10+3/10=1
b) 0,9 : 1/5 + 1/3 -3/5=4,5+1/3 - 3/5=45/10 + 1/3 - 3/5= 135/30+ 10/30 -18/30=145/30- 18/30=127/30=4 7/30
c) (1 : 0,3 -2 1/3)- 5/6=(9/30 - 2 10/30) - 5/6= - 2 1/30 - 5/6= - 2 1/30 - 25/30= - 2 26/30= - 2 13/15
d)2 1/7 * 1,6 *2 1/3=15/7 *8/5 * 7/3=8
e)2 6/11: 7/11:3,4=28/11 : 7/11: 17/5=28/11 *11/7 * 5/17=20/17=1 3/17
f)6 2/3 * (0,25 + 1/5)=6 2/3 *(1/4+ 1/5)= 6 2/3 *(5/20 + 4/20)=21/3 * 9/20=63/20=3 3/20
g) 1 5/9 :1 1/3 * 0,75=14/9 *3/4 * 3/4=7/8
h)3 1/3 - 1/3 * 0,6=3 * 0,6=1,8
i) 3 4/9 - 1 2/3 * 1,8=3 4/9 - 1 6/9 * 1,8=1 7/9 * 1,8= 16/9 *9/5= 16/5=3 1/5
j)4,5 * 5 5/9 +6,4 * 3/8=9/2 * 50/9 + 32/5 * 3/8=25 + 2 2/5= 27 2/5