Question

a) /-4,1/ + 1,8+ /-3,5/ -/-4,1/-/-1,8/

b) /\(\dfrac{2}{5}\)/ - /-0,2/ \(\cdot\)/-7/

c) (-15) : /-3/ +/0,5/

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Answer 1

Giải:

a) \(\left|-4,1\right|+1,8+\left|-3,5\right|-\left|-4,1\right|-\left|-1,8\right|\)

\(=4,1+1,8+3,5-4,1-1,8\)

\(=3,5\)

b) \(\left|\dfrac{2}{5}\right|-\left|-0,2\right|.\left|-7\right|\)

\(=\dfrac{2}{5}-0,2.7\)

\(=\dfrac{2}{5}-\dfrac{7}{5}\)

\(=-1\)

c) \(\left(-15\right):\left|-3\right|+\left|0,5\right|\)

\(=\left(-15\right):3+0,5\)

\(=-5+0,5\)

\(=-4,5\)

Chúc bạn học tốt!

Answer 2

\(a)\left|-4,1\right|+1,8+\left|-3,5\right|-\left|-4,1\right|-\left|-1,8\right|\)

\(=4,1+1,8+3,5-4,1-1,8\)

\(=\left(4,1-4,1\right)+\left(1,8-1,8\right)+3,5\)

\(=3,5\)

\(b)\left|\dfrac{2}{5}\right|-\left|-0,2\right|.\left|-7\right|\)

\(=\dfrac{2}{5}-0,2.7\)

\(=\dfrac{2}{5}-\dfrac{7}{5}\)

\(=-1\)

\(c)\left(-15\right):\left|-3\right|+\left|0,5\right|\)

\(=\left(-15\right):3+0,5\)

\(=-5+0,5\)

\(=\dfrac{-9}{2}\)

Chúc bạn học tốt!