Question

Ayuda porfa
1). [(-2)(7)-(-4)(-8)] - [(-6)(3)-(-4)(-10)]
2). [1/2+3/4] + [1/5-1/4]
3). (2/3)×(3/4) + (-5/2)×(3/7)
4). (4/5÷3/2) + (-7/4÷2/3)

Answer 1

1). [(-2)(7)-(-4)(-8)] - [(-6)(3)-(-4)(-10)]

[-14-32]               - [-18-40]

-46 -   [-58]

-46+58

12         RESP.

2). [1/2+3/4] + [1/5-1/4]

$(\frac{1}{2}+ \frac{3}{4}) +(\frac{1}{5} -\frac{1}{4})=(\frac{5}{4}) +(-\frac{1}{20} )=\frac{6}{5}$       RESP.

3). (2/3)×(3/4) + (-5/2)×(3/7)

$(\frac{2}{3}* \frac{3}{4}) +(\frac{-5}{2} *\frac{3}{7})=(\frac{1}{2} )+(-\frac{15}{14} )=\frac{1}{2}- \frac{15}{14}=-\frac{4}{7}$          RESP.

4). (4/5÷3/2) + (-7/4÷2/3)

$(\frac{\frac{4}{5} }{\frac{3}{2} } ) +(\frac{\frac{-7}{4} }{\frac{2}{3} } )=(\frac{8}{15})+ (\frac{-21}{8})=\frac{8}{15} -\frac{21}{8}=\frac{8*8-21*15}{15*8}=\frac{-251}{120}$                RESP.

Answer 2

1) [-14-32]-[-18-40]=-46+58=12
2) [5/4]+[4/20-5/20]=5/4-1/20=25/20-1/20=
=24/20
3) (6/12)+(-15/14)=84/168-180/168=-12/168
4) (8/15)+(-21/8)=64/120-315/120=-251/120