Oblicz. a) [111 1/9 x (0,35-0,125)] : [13,625 : (0,025 + 2,7)] b) (6 11/18 - 3,5) x 2,5 - 4 1/3 : 0,65 c) (1,2 : 0,04 : 5 - 1 1/4) : (2,25 + 0,8 : 2 2/5) legenda: x - razy (mnożenie 1/4 - ułamek (jedna czwarta)

a)[111 1/9 x (0,35-0,125)]:[13,625:(0,025+2,7)]=[1000/9x0,225]:[13,625:2,725]= [1000/9x225/1000]:[13625/1000:2725/1000]=225/9:[13625/1000x1000/2725]=225/9x2725/13625=25x0,2=5 c)(1,2:0,04:5-1 1/4):(2,25+0,8:2 2/5)=(6-1,25):(2,25+8/10:12/5)= 475/100:(225/100+8/10x5/12)=475/100:(225/100+1/3)= 475/100:(675/300+100/300)= 475/100:775/300=475/100x300/775=1425/775=1 650/775=1 26/31 b)(6 11/18-3,5)x2,5-4 1/3:0,65=(119/18-35/10)x25/10-13/3:65/100= (119/18-7/2)x25/10-13/3x100/65=(119/18-63/18)x25/10-20/3= 56/18x5/2-20/3= 28/18x5-20/3=14/9x5-20/3=70/9-20/3=70/9-60/9=10/9=1 1/9