Question

ТОЛЬКО СТОЛБИК СЛЕВА СРОЧНООО ДАЮ 40 БАЛЛОВ

Answer 1

1)

а)

$0,12-1,375=-1,255$

б)

$1\frac{2}{3} -(-0,75)=\frac{4}{3} +\frac{3}{4} =\frac{16+9}{12} =\frac{25}{12} =2\frac{1}{12}$

в)

$-4,2-3,25-(-\frac{1}{12} )=-7\frac{45}{100} +\frac{1}{12} =-\frac{745}{100} +\frac{1}{12} =\\\\=-\frac{149}{20} +\frac{1}{12}=-\frac{447}{60}+\frac{5}{60} =-7\frac{2}{5} =-7,4$

г)

$4\frac{8}{15} -6\frac{7}{12} -(-5\frac{3}{40} )=3,025\\\\1) 4\frac{8}{15} -6\frac{7}{12}=\frac{68}{15} -\frac{79}{12} =\frac{272-395}{60} =-\frac{123}{60} \\\\2)-\frac{123}{60}+\frac{203}{40} =\frac{-246+609}{120} =\frac{363}{120}=\frac{121}{40} =3\frac{1}{40} =3,025$

2)

а) $A(-2)$ и $B(4\frac{1}{3})$

$|-2|+4\frac{1}{3}=2+4\frac{1}{3}=1\frac{3}{3} +4\frac{1}{3} =6\frac{1}{3}$

б) $A(-1,5)$ и $D($$-2\frac{1}{6}$$)$

$-1,5+|-2\frac{1}{6} |=2\frac{1}{6} -1,5=1\frac{7}{6} -1\frac{3}{6} =\frac{4}{6} =\frac{2}{3}$

3)

a)

$x+6,4=1,1\\x=-5,3$

б)

$11,2-x=-\frac{1}{2} \\11,2-x=-0,5\\-x=-11,7\\x=11,7$

в)

$-\frac{1}{3} +x=-\frac{1}{2} \\x=-\frac{1}{2}+\frac{1}{3} \\x=\frac{2}{6} -\frac{3}{6} \\x=-\frac{1}{6}$