4i 1/2* 2/3 - 1/4 :4,5* 2 + 0,4 * 5
4 1/2*2/3-1/4:4,5*2+0,4*5=9/2*2/3-1/4:45/10*2+4/10*5=3-1/9+2=4 8/9
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4 1/2*2/3-1/4:4,5*2+0,4*5=9/2*2/3-1/4:45/10*2+4/10*5=3-1/9+2=4 8/9