4. Найдите значение выражения: 1) |−3,6|+|2,4|; 3) |4,2|+|−1,9|−|3|; 5) |−5/6|−|−1/3|; 7) |−7/8|+|−1,25|; 9) |−11/12|+|−2,5|−|3/4|; 11) |−3,2|·|−1,5|; 13) (|−2,4|+|1,6|)·|−3/4|; 15) (|−3,5|−|1,25|)·(|−4/9|+|5/9|).

1. \(|-3.6|+|2.4|=3.6+2.4=6\).
2. \(|4.2|+|-1.9|-|3|=4.2+1.9-3=3.1\).
3. \(\left|-\frac56\right|-\left|-\frac13\right|=\frac56-\frac13=\frac56-\frac26=\frac12\).
4. \(\left|-\frac78\right|+|-1.25|=\frac78+1.25=\frac78+\frac54=\frac{17}{8}=2.125\).
5. \(\left|-\frac{11}{12}\right|+|-2.5|-\left|\frac34\right|=\frac{11}{12}+\frac52-\frac34=\frac{8}{3}\).
6. \(|-3.2|\cdot|-1.5|=3.2\cdot1.5=4.8\).
7. \((|-2.4|+|1.6|)\cdot\left|-\frac34\right|=(2.4+1.6)\cdot\frac34=4\cdot\frac34=3\).
8. \((|-3.5|-|1.25|)\cdot\left(\left|-\frac49\right|+\left|\frac59\right|\right)=(3.5-1.25)\cdot\left(\frac49+\frac59\right)=2.25\cdot1=2.25\).

Ответ: 1) 6; 3) 3,1; 5) \(\frac12\); 7) \(\frac{17}{8}=2,125\); 9) \(\frac83\); 11) 4,8; 13) 3; 15) 2,25.