Применены свойства степени
2/7=700:7×2=200
2/5=700:5×2=280
200+280=480
700-480=220
1. 1) <span>739 + 245 = 984
2) 31*29 = 899
3) 984:82 = 12
4) 12 + 899 = 911
2. 1) </span><span>469 - 398 = 71
</span><span> 2) 13*71 = 923
3) 42*21 =882
4) 882:63 =14
5) 923 - 14 = 909
<em> Вроде так.</em>
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5+8 = 5 + (5+3) = (5 + 5)+3 = 10 + 3 = 13
5+(5+8) = 5+(5+8) = (5 + 5)+8 = 10 + 8 = 18
6+8 = 6+(4+4) = (6+4) +4 = 10 + 4 = 14
7+8 = 7+(3+5) = (7+ 3) +5 = 10 + 5 = 15
1) А(1;1) и В(1;3), С(2;1) и D(4;1), L(3;3) и M(3;5)
2) Z(-3;0), S(2;0), U(2;-2)
F(-6;7), P(8;10), W(11;0)