Question

Rozwiąż proszę o pełne uzasadnienie

a) (0,5 + 2 1/4) : 0,2 =
l) 4 - 2 : (-1/4) - (-3:9)2 czyli razy 2 =
f) (5/6 + 1/3) : (2 2/3 - 1 1/5) =
e) 2 - 1,8 x (2/3 - 0,25) =
d) 4 - ( 2,5 - 1 1/5) =
i) 0,4 + 2 x 1 1/4
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0/37

Answer 1

A) (0,5+2 1/4):0,2= (5/10+2 1/4):2/10=(5/10+9/4)*10/2=(20/40+90/40)*10/2= 110/40*10/2=55/4= 13 3/4

l) 4-2:(-1/4)-(-3:9)*2=4-2/1*(-4/1)-(-3/1*1/9)*2=4-(-8)-(-1/3)*2=4-(-2/3)=4+8+2/3= 12 2/3

f) (5/6+1/3):(2 2/3-1 1/5)= (5/6+2/6):(8/8-6/5)=7/6:(80/80-112/80)=7/6:(-32/80)=7/6*(-80/32)= -280/96= - 2 88/96= - 2 11/13

e) 2-1,8*(2/3-0,25)=2-1 8/10*(2/3-25/100)=2-18/10*(200/300-75/300)=2-18/10*125/300-2-100/150=2/1-100/150=300/150-100/150=200/150=1 50/150= 1 1/3

d) 4-(2,5-1 1/5)= 4-( 2 5/10- 1 1/5)= 4- (25/10-6/5)= 4-(25/10-12/10)=4-13/10=40/1--13/10=27/10= 2 7/10

i) 0,4+2*1 1/4= 4/10+2/1*1 1/4= 4/10+2/1*5/4=4/10+5/2= 4/10+25/10= 29/10= 2 9/10