Question

Wykonaj przyklady (tylko prosze z obliczeniami :D 1. 2/5 (dwie piate)- (-2 1/4)* (- 4/5)+1 2/5 : - 2/5= 2. (-14)+6*(-16) = -5 3. 4/5 + (- 1 1/5): 2 2/5+ 3/8 *(-3/5)=

Answer 1

1. 2/5 (dwie piate)- (-2 1/4)* (- 4/5)+1 2/5 : - 2/5= 

=2/5-(-9/4)*(-4/5)+7/5:(-2/5)=

=2/5-9/5+7/5*(-5/2)=

=2/5-9/5-7/2=

=-7/5-7/2=

=-14/10-35/10=

=-39/10=

=-3,9

 

 

2. (-14)+6*(-16) = -5

-14-96=-5

-110≠-5

sprzeczne

 

3. 4/5 + (- 1 1/5): 2 2/5+ 3/8 *(-3/5)=

=4/5-6/5:12/5-9/40=

=4/5-6/5*5/12-9/40=

=4/5-1/2-9/40=

=32/40-20/40-9/40=

=12/40-9/40=

=3/40

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