12 zadanie str 13 matma wokol nas zbior zadan.
2 3/5 * 6 1/4 -3 1/4 :3 5/7 +0.625
4 4/5 : 1.6 *1 7/8 - 1 5/8 + 2.25
28 3/5 -0.6 * (8 2/3 - 3 1/4 + 2 1/2 - 5/12)
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=65/4-7/8+0,625=123/8+625/1000=123/8+5/8=16
4 4/5 : 1.6 *1 7/8 - 1 5/8 + 2.25=24/5:1,6*1 7/8-1 5/8+2,25=3*15/8-1 5/8+2,25=45/8-13/8+2,25=4+2,25=4+225/100=4+9/4=25/4=6 1/4
28 3/5 -0.6 * (8 2/3 - 3 1/4 + 2 1/2 - 5/12)=143/5-0,6*(26/3-13/4+2 1/2-5/12)=143/5-0,6*(65/12+5/2-5/12)=143/5-0,6*(95/12-5/12)=143/5-6/10*15/12=143/5-3/5*15/2=143/5-9/2=241/10=24 1/10