8. Упростите выражение: 1) −1,2·3a; 2) −0,8x·(−0,7); 3) −5b·2,4c; 4) −6a·0,7b·(−0,5c); 5) −4/15 x·5/16·(−y); 6) 1 3/5 x·(−15/32 y).

Question

Accepted Answer

\(−1.2\cdot3a=−3.6a\).
\(−0.8x\cdot(−0.7)=0.56x\).
\(−5b\cdot2.4c=−12bc\).
\(−6a\cdot0.7b\cdot(−0.5c)=2.1abc\).
\(−\frac{4}{15}x\cdot\frac{5}{16}\cdot(−y)=\frac{1}{12}xy\).
\(1\frac{3}{5}x\cdot\left(−\frac{15}{32}y\right)=\frac{8}{5}x\cdot\left(−\frac{15}{32}y\right)=−\frac{3}{4}xy\).

Ответ: 1) \(−3.6a\); 2) \(0.56x\); 3) \(−12bc\); 4) \(2.1abc\); 5) \(\frac{1}{12}xy\); 6) \(−\frac{3}{4}xy\).