вычисли, используя распределит. св-во умножения
а) (1/6 + 2/15 - 1/10) * 60
б)2 4/9 * 12 + 6 * 2 4/9
________________
2 4/9 * 9
а) (1/6 + 2/15 - 1/10) * 60
б)2 4/9 * 12 + 6 * 2 4/9
________________
2 4/9 * 9
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б)2 4/9 * 12 + 6 * 2 4/9
________________
2 4/9 * 9
=(2+4/9)*12+6*(2+4/9)
_________________
(2+4/9)*9
= 2*12+4/9*12+6*2+6*4/9
___________________
2*9+4/9*9
= 24+16/3+12+8/3
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18+4
= 36 +24/3
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22
=36+8
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22
= 44/22= 2