Question

[nguyễn hoa]

6,5+ 1,2+3,5-5,2+6,5-4,8

(-4,3.1,1+1,1.4,5): (-0,5:0,05+10,01)

(6,7+5,66-3,7+4,34). (-76,6.1,2+7,66.12)

Answer 1

[Nguyễn Thanh Hằng]

a/ \(6,5+1,2+3,5-5,2+6,5-4,8\)

\(=\left(6,5+3,5+6,5\right)+1,2-\left(5,2+4,8\right)\)

\(=16,5+1,2-10\)

\(=17,7-10=7,7\)

b/ \(\left(-4,3.1,1+1,1.4,5\right):\left(-0,5:0,05+10,01\right)\)

\(=1,1\left(-4,3+4,5\right):\left(-10+10,01\right)\)

\(=1,1.0,2:0,01\)

\(=1,1.20=22\)

c/ \(\left(6,7+5,66-3,7+4,34\right).\left(-76,6.1,2+7,66.12\right)\)

\(=\left[\left(5,66+4,34\right)+\left(6,7-3,7\right)\right]\left[7,66.\left(-10\right).1,2+7,66.12\right]\)

\(=\left(10+3\right).\left[7,66\left(-12\right)+7,66.12\right]\)

\(=13.0=0\)

Answer 2

[Nguyễn Thị Hồng Nhung]

\(\text{6,5+ 1,2+3,5-5,2+6,5-4,8}=\left(6,5+3,5\right)+\left(-5,2-4,8\right)+\left(1,2+6,5\right)\)

=10-10+7,7=7,7

\(\text{(-4,3.1,1+1,1.4,5): (-0,5:0,05+10,01)}=\dfrac{1,1.\left(-4,3+4,5\right)}{-10+10,01}=\dfrac{0,22}{0,01}=22\)

\(\text{(6,7+5,66-3,7+4,34). (-76,6.1,2+7,66.12)}\)

=(6,7+5,66-3,7+4,34)(-76,6.1,2+76,6.1,2)=0