7/15 - 2/21 × 0,7 = ??? 8/5 ÷ 0,1 = ??? (-1/2)² × 24 - 1 = ???

Question

7/15 - 2/21 × 0,7 = ???

8/5 ÷ 0,1 = ???

(-1/2)² × 24 - 1 = ???

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Answer 1

А-3
7\15-2\21*0.7=0.4
-2\21*7\10=-2\30
7\15-2\30=14\30-2\30=12\30=2\5=0.4
Б-2
8\5:0.1=16
8\5:1\10=8*10\5*1=16\1=16
В-4
(-1\2)^2*24-1=5
1\4*24=6\1=6
6-1=5