Odpowiedź:
Zad 2
a) 25/8 ; 3,25 ; 3.7 ; 75/20 ;
b) 1,397 ; 1,4 ; 12/7 ; 13/5 ;
Zad 3
a) 1/4 = 0,25
1/5 = 0,2
27/100= 0,27
b) 1,201
2,37
2,3
2,125
Zad 4
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 = 9,875
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
Zad 5
6,5:(2 1/4x6-0,5)=6,5:(9/4x6/1-5/10)=6,5:(27/2-1/2)=65/10:26/2=65/10x2/26=65/130=1/2
(5-1 1/2):(2 3/8-1,75)=3,5:5/8=35/10x8/5=28/5=5 3/5
3/34x0,8+2 2/3x3,0=3/34x8/10+8/3x9/3=12/170+24/3=12/170+8=8 6/85
5/7x4,2-(1 1/4-0,5)=5/7x42/10-(5/4-2/4)=6/2-3/4=12/4-3/4=9/4=2 1/4=2,25
4 1/2-2,4:2 2/3+1,4=4 1/2-24/10x3/8+14/10=4 5/10-9/10+14/10=3 6/10+14/10=3 20/10=5
Miałem to na lekcji ;p
