(-12)+5-(-32)
\(\sqrt{17-3\sqrt{32}-\sqrt{17+3\sqrt{32}}}\)
\(\sqrt{36-12\sqrt{5}-\sqrt{36+12\sqrt{5}}}\)
\(\sqrt{36-12\sqrt{5}-\sqrt{36+12\sqrt{5}}}\)
2-{3+5-[-12+5-(-3+7)-12]}+32
=2-[8-(-7-4-12)]+32
=2-[8-(-23)]+32
=2-31+32
=-29+32
=3
=2-{8-[-12+5-3-7+12]}+32
=2-{8-[(-12)+12+5-3-7]+32
=2-{8-[0+5-3-7]+32
=2-{8-(-5)}+32
=2-13+32
=21
2 - { 3 + 5 - [ - 12 + 5 - ( -3 + 7 ) - 12 ] + 32 }
\(=2-\left\{8-\left[-7+3-7-12\right]+32\right\}\)
\(=2-\left\{40-\left[-23\right]\right\}=2-63=-61\)
2-{3+5-[-12+5-(-3+7)-12]+32]
2-{3+5-[-12+5-(-3+7)-12]+32]
= 2-{3+5-[-12+5- 4 -12]+32]
=2-{3+5-[-7- 4 -12]+32]
= 2-{3+5-[-11 -12]+32]
= 2-{3+5-1+32]
= 2-{8-1+32]
=2-{7+32]
=2-32
=-30
2-{3+5-[-12+5-(-3+7)-12]+32 =2-{3+5-[-12+5+3-7-12]+32} =2-{3+5+12-5-3+7+12+32} =2-{(3-3)+(5-5)+(12+12+7+32)} =2-{0+63}=2-63=-61
2-{3+5-[-12+5-(-3+7)-12]+32}
=2-{8-[-12+5-4-12]+32}
=2-{8-[(-12+5)-4-12]+32}
=2-{8-[-7-4-12]+32}
=2-{8-[(-7-4)-12]+32}
=2-{8-[-11-12]+32}
=2-{8-(-23)+32}
=2-{[8-(-23)]+32}
=2-{31+32}
=2-63
=-61
tính : 2- { 3+ 5 [ -12 + 5 - ( -3 + 7 ) - 12 ] + 32 }
2 - { 3 + 5 [ -12 + 5 - ( -3 + 7 ) - 12 ] + 32}
= 2 - { 3 + 5 [ -12 + 5 - 4 - 12 ] + 32}
= 2 - { 3 + 5 [ -7 - 4 - 12 ] + 32 }
= 2 - { 3 + 5 [ - 11 - 12 ] + 32 }
= 2 - { 3 + 5 x (- 23) ] + 32 }
= 2 - { 8 x (-23) ] + 32 }
= 2 - { -184 + 32 }
= 2 + 152
= 154
Tìm số nguyên x biết:
1, -x +(-53) =(-42) - 41
2. -12 - x= -32 +19
3.453+x = -443+(-199)
4. -12-x = -32 +19
5. 32.(-2) +x = -120 -5.(-85)
6. -2x + 15.(-4) = 21.(-8) -12
5 ngày 2 giờ- 2 ngày 12 giờ, 32 phút 32 giây nhân 3
5 ngày 2 giờ-2 ngày 12 giờ=122h-60h=62h
32 phút 32 giây x3=96 phút 96 giây=97 phút 36 giây
Đề 2
1) Tính nhanh(nếu có thể)
a) -14+12+(-12)(23-7)
b) (-5)+2(-15)-(-3)+|-10|
c) 68.(12+32)-32.(68-12)
d) 89-(-43)-32
e) -12.(-6)2+(-4)3.12
1 Tính nhanh
a) \(-14+12+\left(-12\right)\left(2^3-7\right)\)
\(=-14+\left[12+\left(-12\right)\right].1\)
\(=-14+0.1\)
\(=-14+0=-14\)
b) \(\left(-5\right)+2\left(-15\right)-\left(-3\right)+\left|-10\right|\)
\(=\left(-5\right)+\left(-30\right)-\left(-3\right)+10\)
\(=\left(-35\right)-\left(-3\right)+10\)
\(=\left(-32\right)+10\)
\(=-22\)
c) \(68.\left(12+32\right)-32.\left(68-12\right)\)
\(=68.44-32.56\)
\(=2992-1792\)
\(=1200\)
d) \(89-\left(-43\right)-32\)
\(=132-32\)
\(=100\)
e) \(-12.\left(-6\right)^2+\left(-4\right)^3.12\)
\(=-12.36+64.12\)
\(=\left(-12+12\right).\left(36+64\right)\)
\(=0+100\)
\(=100\)
Tính hợp lý:
45-58+(-45)+(+58)-3
(-57)-(-12)+3-(-57)
-(-24)-(-30)+(-24)-30+8
-(-12)+(+19)-(+12)+8-19
47-(-53)+(-47)-(+53)
-(+28)+32-(-28)+(-34)
15-(+72)+(-15)+(+72)
20-(+46)+(-25)-(-46)
28-(-32)+(-28)-32+5
-75+(-49)+(+75)+49-12
Giúp e vs ạ
45-58+(-45)+(+58)-3=45-58-45+58-3=(45-45)+(58-58)-3=-3
(-57)-(-12)+3-(-57)=-57+12+3+57=(-57+57)+12+3=15
-(-24)-(-30)+(-24)-30+8=24+30-24-30+8=(24-24)+(30-30)+8=8
-(-12)+(+19)-(+12)+8-19=12+19-12+8-19=(12-12)+(19-19)+8=8
47-(-53)+(-47)-(+53)=47+53-47-53=(47-47)+(53-53)=0
-(+28)+32-(-28)+(-34)=-28+32+28-34=(-28+28)-(34-32)=-2
15-(+72)+(-15)+(+72)=15-72-15+72=(15-15)+(72-72)=0
20-(+46)+(-25)-(-46)=20-46-25+46=(20-25)+(46-46)=-5
28-(-32)+(-28)-32+5=28+32-28-32+5=(28-28)+(32-32)+5=5
-75+(-49)+(+75)+49-12=-75-49+75+49-12=(-75+75)+(49-49)-12=-12
\(...=45-58-45+58-3=-3\)
\(...=-57+12+3+57=15\)
\(...=24+30-24-30+8=8\)
\(...=12+19-12+8-19=8\)
\(...=47+53-47-53=0\)
\(...=-28+32+28-34=-2\)
\(...=15-72-15+72=0\)
\(...=20-46-25+46=-5\)
\(=...28+32-28-32+5=5\)
\(...=-75-49+75+49-12=-12\)