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Answer 1

1)

$(-8.9+1.5):3.7=-7.4:3.7=-2$

2)

$(\frac{8}{9} -\frac{5}{18} )*\frac{9}{22} =(\frac{16}{18} -\frac{5}{18} )*\frac{9}{22}=\frac{11}{18} *\frac{9}{22} =\frac{1}{4}$

3)

$-13*6+53=-78+53=-25$

4)

$\frac{11}{30} +\frac{9}{25} :(2-1\frac{23}{35} )-1\frac{1}{3} =\frac{11}{30} +\frac{9}{25} :(2-\frac{58}{35} )-\frac{4}{3} =\frac{11}{30} +\frac{9}{25} :\frac{12}{35} -\frac{4}{3} =\\\\=\frac{11}{30} +\frac{9}{25} *\frac{35}{12} -\frac{4}{3} =\frac{11}{30} +\frac{21}{20} -\frac{4}{3} =\frac{22}{60} +\frac{63}{60} -\frac{80}{60} =\frac{5}{60} =\frac{1}{12}$

5)

$-56:4+32=-14+32=18$

6)

$(\frac{4}{5} -\frac{8}{15} )*\frac{5}{12} =(\frac{12}{15} -\frac{8}{15} )*\frac{5}{12} =\frac{4}{15} *\frac{5}{12} =\frac{1}{9}$

7)

$(-7.5+1.7):2.9=-5.8:2.9=-2$

8)

$\frac{9}{16} *(\frac{1}{4}+\frac{5}{12} )-\frac{8}{15} :\frac{16}{45} =\frac{9}{16} *(\frac{3}{12} +\frac{5}{12} )-\frac{8}{15} *\frac{45}{16} =\frac{9}{16} *\frac{8}{12} -\frac{3}{2} =\frac{3}{8} -\frac{3}{2} =\frac{3}{8} -\frac{12}{8} =-\frac{9}{8}$