Thực hiện phép tính :
a.128-[ 68+8 ( 37-35 ) ² ]
b.107-{ 38+[7.3 ²-24:6+(9-7) ³]}:15
c.2020 + [38-(7-1) ² – 2021 MŨ 0
Thực hiện phép tính :
a.128-[ 68+8 ( 37-35 ) ² ]
b.107-{ 38+[7.3 ²-24:6+(9-7) ³]}:15
c.2020 + [38-(7-1) ² – 2021 MŨ 0
Đáp án+Giải thích các bước giải:
`a,128-[68+8.(37-35)^2]:4`
`=128-[68+8.2^2]:4`
`=128-(68+32):4`
`=128-100:4`
`=128-25`
`=103`
`b,107-{38+[7.3^2-24:6+(9-7)^3]}:15`
`=107-[38+(7.9-4+2^3)]:15`
`=107-[38+63-4+8]:15`
`=107-105:15`
`=107-7`
`=100`
`c,2020+[38-(7-1)^2-2021^0]`
`=2020+[38-6^2-1]`
`=2020+38-36-1`
`=2020+1`
`=2020`
`cancel{no copy}`
a, 128-[ 68+8 . ( 37-35 ) ² ]
= 128 – [ 68 + 8 . 2² ]
= 128 – [ 68 + 8 . 4 ]
= 128 – [ 68 + 32 ]
= 128 – 100
= 28
b, 107-{ 38+[7.3 ²-24:6+(9-7)³ ] } : 15
= 107 – { 38 + [ 7 . 9 – 4 + 2³ ] } : 15
= 107 – { 38 + [ 63 – 4 . 8 ] } : 15
= 107 – { 38 + [ 63 – 32 ] } : 15
= 107 – { 38 + 31 } : 15
= 107 – 69 : 15
= 107 – 4,6
= 102,4
c, 2020 + [38-(7-1)² – 2020^0 ]
= 2020 + [ 38 – 6² – 1 ]
= 2020 + [ 38 – 36 – 1 ]
= 2020 + [ 2 – 1 ]
= 2020 + 1
= 2021