<span>728-(72*8)=728 - 576 = 152</span>
<span>(728+72)/8=100</span>
<span>728-(72/8)=719
728 + (72 : 8) = 728 + 9 = 737 </span>
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</span>
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</span>
220=11*2*2*5
165=11*3*5
77=11*7
НОД=11
63=7*3*3
42=7*3*2
168=7*2*2*2*3
НОД=7*3=21
230=23*2*5
92=23*2*2
138=23*2*3
НОД=23*2=46
42=2*3*7
650=2*5*5*13
260=2*2*5*13
НОД=2
<span>1) -8+4,2+(-9)+5,8= -7
2) -1,7+(-3,3)+5= 0
3) -19+18,74+(-18,74)= -19
4)-4.9/16+5.7/18+4.9/16+(-5.7/18)=</span> 0