Oblicz: 420-20• dwie trzecie +6,25: pięć ósmych

420 - 20 · 2/3 +6,25 : 5/8 = 420 - 40/3 +6 i 1/4 : 5/8 = 420 - 13 i 1/3 +25/4 ·8/5 = =419 i 3/3 - 13 i 1/3 +10 = 406 i 2/3 +10 = 416 i 2/3

420-20*2/3+6,25:5/8= 420-40/3+6 1/4:5/8= 420-13 1/3+25/4*8/5= 420-13 1/3+10= 430-13 1/3= 429 3/3-13 1/3=416 2/3