Question

doar exercitiile 5,6,7 dau coronitaaa

Answer 1

5a
2/3+3/4+7/10=(2*20+3*15+7*6)/60=(40+45+42)/60=127/60
7/8-(1/2-1/4)=7/8-1/2+1/4)=(7-1*4+1*2)/8=(7-4+2)/8=5/8
5b
(3 3/8+1 1/6)-(2 2/3+1/4)=
=27/8+7/6-8/3-1/4=(27*3+7*4-8*8-1*6)/24=(81+28-64-6)/24=39/24=13/8

6
2/7+2/5+3/7+1/5+2/7+7/5=2/7+3/7+2/7+1/5+2/5+7/5=7/7+10/5=1+2=3

7
12 7/8 -8 1/4=103/8 -32/4=103/8-66/8=37/8

12-8=4
7/8-1/4=7/8-2/8=5/8
4+5/8=37/8

25 1/4-11 2/2=101/4-12=(101-12*4)/4=53/4
11 2/2=12
25-12=13
13+1/4=(13*4+1)/4=53/4

29 1/3 -16 5/6=88/3-101/6=176/6-101/6=75/6=25/2
29 1/3-16 5/6=28 4/3-16 5/6
28-16=12
4/3-5/6=8/6-5/6=3/6=1/2
12+1/2=25/2