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Bài 1
a) 15 + 4.12 - 3²
=15 + 48 - 9
= 63 - 9
= 54
b) {[(37 + 13) : 5].2 - 45 : 5}.7 - 2022⁰
= [(50 : 5).2 - 9].7 - 1
= (10.2 - 9).7 - 1
= (20 - 9).7 - 1
= 11.7 - 1
= 77 - 1
= 76
Bài 2
a) 13x + 3 = 16
13x = 16 - 3
13x = 13
x = 13 : 13
x = 1
b) 2x - 138 = 2⁴ : 2³
2x = 2 + 138
2x = 140
x = 140 : 2
x = 70
a: \(=\dfrac{216+3\cdot36+27}{13}=\dfrac{351}{13}=27\)
b: \(=\dfrac{1140-200-40}{9}+3^4=900+81=981\)
1, 27.(13-16)-16.(13-27)=27.(-3)-16(-14)=-81-(-224)=143
2 -1911-(1234-1911)=-1911-1234+1911=-1234
3 32.(-39)+16.(-22)=16.2(-39)+16(-22)=16(-78)+16(-22)=16[(-78)+(-22)]=16.(-100)=-1600
4 -(567-1945)-1945=-567+1945-1945=-567
5 44.(-36)+22.(-28)=22.2(-36)+22(-28)=22(-72)+22(-28)=22[(-72)+(-28)]=22.(-100)=-2200
k mình nhé
a, 36:{336:[200–(12+8.20)]}
= 36:{336:[200–(12+160)]}
= 36:{336:[200–172]}
= 36:{336:28}
= 36:12 = 3
b, {145–[130–(246–236)]:2}.5
= {145–[130–10:2]}.5
= {145–130}.5
= 20.5 = 100
c, 100:{250:[450–(4. 5 3 – 2 2 .25]}
= 100:{250:[450–400]}
= 100:{250:50}
= 100:5 = 20
d, 798+100:[16–2.( 5 2 –22)]
= 798+100:10
= 798+10 = 808
e, (6954+1525:5+47.19).(29–58.2)
= (6954+1525:5+47.19).0 = 0
f, 2 4 .157– 2 4 .58+16
= 16.(157–58+1) = 1600
Viết lại đề: \(24+\left\{29-\left[32-\left(16-3.2^2\right)\right]\right\}\)
\(24+\left\{29-\left[32-\left(16-3.2^2\right)\right]\right\}\)
= \(24+\left\{29-\left[32-\left(16-12\right)\right]\right\}\)
= \(24+\left\{29-\left[32-4\right]\right\}\)
= \(24+\left\{29-28\right\}\)
= \(24+\left\{29-28\right\}\)
= \(24+1\)
= \(25\)