Cho mik xin hay nhất nhé bn

Giải thích các bước giải:

 Bài 1 :

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a)5.$2^{2}$-18:3 

=5.4-18:3

=20-6

=14

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b)17.85+15.17-120

=17.(85 +15)-120

=17.100-120

=1700-120

=1550

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c)$2^{3}$ .17-$2^{3}$ .14

=8 . 17 - 8 .14

=8.(17-14)

=8.3

=24

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d)20-[30-$(5-1)^{2}$ ]

=20-[30-$4^{2}$ ]

=20-[30-16]

=20-14

=6

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e)75-(3.$5^{2}$ -4.$2^{3}$ )

=75-(3.25-4.8)

=75-(75-32)

=75-43

=32

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f)2.$5^{2}$ +3:$71^{0}$ -54:$3^{3}$ 

=2 . 25 + 3:1 -54 : 27 

=50 + 3 - 2 

=51 

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g)150+50:5-2.$3^{2}$ 

=150 + 50 :5 -2 . 9

=150+10-18

=160-18

=142

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h)5.$3^{2}$ -32:$4^{2}$ 

=5.9-32:16

=45-2 

=43 

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Bài 2 :

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a)27.75+25.27-150

=27.(75+25)-150

=27.100-150

=2700-150

=2550

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b)12:{400:[500-(125+25.7)]}

=12:{400:[500-(125+175)]}

=12:{400:[500-300]}

=12:{400:200}

=12:2

=6

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c)13.17-256 :16+14 :7-1

=221-16+2-1

=205+2-1

=207-1

=206

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d)18:3+182+3.(51:17)

=18:3+182+3.3

=6+182+9

=188+9

=197

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e)15-25.8:(100.2)

=15-25.8:200

=15-200:200

=15-1

=14

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f)25.8-12.5+170 :17-8 

=200-60+10-8

=140+10-8

=150 -8

=142 

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