Oblicz. Pamiętaj o kolejności wykonywania działań.
2,5 + 2 3/4 x 6/11 =
145 1/2 - 4,2 : 0,03 =
(4,6 + 2 4/5) x (1 3/5 - 0,7) =
3 1/8 - 3 1/4 : 5 1/5 =
6,03 : 0,3 + 1,8 x 2,5 =
2 1/5 x 3 + 7,8 =
12 1/2 - 5,05 : 0,5 =
1 1/4 : 3 1/3 x 5/9 =
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a)2,5 + 2 3/4 x 6/11 = 2,5+11/3*6/11=2,5+2=5/2+2=9/2=4 1/2
b)145 1/2 - 4,2 : 0,03 =291/2-21/5:3/100=291/2-21/5*100/3=291/2-140=11/2= 5 1/2
c)(4,6 + 2 4/5) x (1 3/5 - 0,7) = (46/10+14/5)*(8/5-7/10)= (23/5+14/5)*(8/5-7/10)=
=37/5*9/10=333/50= 6 33/50
d)3 1/8 - 3 1/4 : 5 1/5 =25/8-13/4:26/5=25/8-13/4*5/26=25/8-5/8=5/2= 2 1/2
e)6,03 : 0,3 + 1,8 x 2,5 = 20,1+4,5=24,6
f)2 1/5 x 3 + 7,8 = 11/5*3+7,8=33/5+7,8=6,6+7,8=14,4
g)12 1/2 - 5,05 : 0,5 = 25/2-10,1=12,5-10,1=11,4
h)1 1/4 : 3 1/3 x 5/9 =5/4:10/3*5/9=5/4*3/10*5/9=5/24