Question

помогите решить 1). 30·(-0,1)³+7·(-0,1)²-3,9=  2).-0,6·(-9)⁴+1,9·(-9)²-4= 3) .3⁸· 3⁵ ÷3⁹=

Answer 1

1)
$30 \times - 0.001 + 7 \times 0.01 - 3.9 = - 0.03 + 0.07 - 3.9 = - 3.9 + 0.04 = - 3.86$
2)
$- 0.6 \times 6561 + 1.9 \times 81 - 4$
=−3786,7
3)
${3}^{8} \times {3}^{5} \times {3}^{ - 9} = {3}^{4} = 81$