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1/2 * 3 1/3 = 3 1/6
6 1/4 + 5,5 = 6 1/4 +5 5/10 = 11 6/14
7,2 : 1 3/5 = 7 2/10 : 1 3/5 = 72/10 :8/5 = 72/10 * 5/8 =9/2 = 4 1/2
1) 3 3\7 +1 2\5 =24/7+7/5=120/35+49/35=169/35=4 29/35
2) 6 2/9+4 7/8=56/9-39/8=448/72-351/72=97/72=1 25/72
3) 1/2*3 1/3=1/2*10/3=5/3= 1 2/3
4) 3 3/4*1 3/5=15/4*8/5=6
5) 5/12:1/9=5/12*9/1=15/4=3 3/4
6) 4 3/8:1 3/32=35/8:35/32=35/8*32/35=4
7) 6 1/4+5,5=6 1/4+5 1/2=25/4+11/2=25/4+22/4=47/4=11 3/4
8) 3,5*1/7=3 1/2*1/7=7/2*1/7=1/2
9) 1 1/3-0,1=1 1/3-1/10=4/3-1/10=40/30-3/30=37/30=1 3/30= 1 1/10
10) 7,2:1 3/5=7 1/5:1 3/5=36/5:8/5=36/5*5/8=9/2=4 1/2
11) 1,5+x=3 3/4
1 1/2+x=3 3/4
3/2+x=15/4
x=15/4-3/2
x=15/4-6/4
x=9/4
x=2 1/4
12) 3/7*x=2,5
3/7*x=2 1/2
3/7*x=5/2 /* 7/3
x=5/2*7/3
x=35/6
x=5 5/6
Zad.2
4 2/3+1 3/7=14/3+10/7=98/21+30/21=128/21=6 2/21
Zad.3
20*3/4=15
h=2*20=40cm
h=40cm
P=(a+b)*h/2
P=(15+20)*40/2
P=35*20
P=700cm²
P.S. Jeżeli będziesz miała jakieś pytania, to pisz ;)