bài 1 : Thực hiện phép tính :
a, 120-[100:( 2 mũ 3 -4)]
b, 3 mũ 3 : 3 mũ 2 + 2 mũ 3 nhân 2 mũ 2
c, 100: {250 :[450-(4 . 5 mũ 3 – 2 mũ 2 . 25 )]}
d,30.{175 :[355-(135+ 37.5)]}
e, 2.(4 mũ 2 -9 ) + 3 mũ 2 ( 15 -10)]
f,500-{ 5.[409-(2 mũ 3 .3 – 21) . 2 ] + 10 mũ 3 } :15
a, 120-[ 100:( 2³-4)]
= 120-( 100:4)
= 120-25
= 95
b, 3³:3²+2³.2²
= $3^{3-2}$+$2^{3+2}$
= 3+$2^{5}$
= 35
c, 100: {250 :[450-(4 . 5³ – 2² . 25 )]}
= 100: [ 250:( 450-400)]
= 100: ( 250:50)
= 100:5
= 20
d, 30.{175 :[355-(135+ 37.5)]}
= 30.[ 175:( 355-320)]
= 30.( 175:25)
= 30.7
= 210
e, 2.( 4²-9)+3².( 15-10)
= 2.7+3².5
= 59
f, 500-{ 5.[409-(2³ .3 – 21) . 2 ] + 10³ } :15
= 500-[ 5.(409-3)+10³]:15
= 500-( 2030+10³):15
= 500-202
= 298
` a) ` ` 120-[ 100:( 2^3 -4)] `
` = 120-( 100:4) `
` = 120-25 `
` = 95 `
` b) ` ` 3^3 : 3^2 +2^3 . 2^2 `
` = 3 + 2^5 `
` = 3 + 32 `
` = 35 `
` c) ` ` 100: {250 :[450-(4 . 5^3 – 2^2 . 25 )]} `
` = 100: [ 250:( 450-400)] `
` = 100: ( 250:50) `
` = 100:5 `
` = 20 `
` d) ` ` 30.{175 :[355-(135+ 37.5)]} `
` = 30.[ 175:( 355-320)] `
` = 30.(175:25) `
` = 30.7 `
` = 210 `
` e) ` ` 2.( 4^2 – 9)+3^2.( 15-10) `
` = 2.7+3^2 . 5 `
` = 14 + 9. 5 `
` = 14 + 45 `
` = 59 `
` f) ` ` 500-{ 5.[409-(2^3 .3 – 21) . 2 ] + 10^3 } :15 `
` = 500-[ 5.(409-3)+10^3]:15 `
` = 500-( 2030+10^3):15 `
` = 500-202 `
` = 298 `