tính
a, 79.3^2+21.2^3
b, 2.(6.4^2-85:5)
c, (-5).8.(-2).3
d, 200+32-(50+32)
Những câu hỏi liên quan
a) 79 . 23 + 21 . 23
b) 2. ( 6 . 42 – 85 : 5)
c) (-5) .8 . (-2) . 3
d) 200 +32 –( 50 +32 )
e) 3 . (-2)2 + 4 . (-5) +20
a) \(79.2^3+21.2^3\)
\(=\left(79+21\right).2^3=100.8\)
= 800
b) \(2.\left(6.4^2-85:5\right)\)
\(=2.\left(96-17\right)=2.79\)
= 158
c) (- 5) . 8 . (- 2) . 3
= \(\left[\left(-5\right).\left(-2\right)\right].\left(8.3\right)\)
= 10 . 24 = 240
d) 200 + 32 - (50 + 32)
= 200 + 32 - 50 - 32 (quy tắc mở ngoặc đổi dấu)
= 200 + (32 - 32) - 50
= 200 - 50 = 150
e) 3 . \(\left(-2\right)^2\) + 4 . (- 5) + 20
= 3 . 4 + 4 .(- 5) + 20
= 4 . (-2) + 20
= - 8 + 20 = 12
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a) 79. 23 + 21 . 23
= 79 . 8 + 21 . 8
= ( 79 + 21 ) . 8
= 100 . 8
= 800
b) 2. ( 6 . 42 - 85 : 5 )
= 2 . ( 6 . 16 - 17 )
= 2 . ( 96 - 17 )
= 2 . 17
= 34
c) (-5) . 8 . (-2) . 30
= (-40) . (-2) . 3
= 80 . 3
= 240
d) 200 + 32 - ( 50 + 32 )
= 232 - 82
= 150
e) 3. (-2)2 + 4. (-5) + 20
= 3. (-4) + 4 . ( -5) + 20
= (-12 ) + (-20) + 20
= (-12) + 0
= (-12)
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\(a,79.2^3+21.2^3.\)
\(=\left(79+21\right)2^3.\)
\(=100.2^3=100.8=800.\)
\(b,2\left(6.4^2-85:5\right).\)
\(=2\left(6.16-17\right).\)
\(=2\left(96-17\right).\)
\(=2.81=162.\)
\(c,\left(-5\right).8.\left(-2\right).3.\)
\(=\left[\left(-5\right).\left(-2\right)\right].\left(8.3\right).\)
\(=10.24=240.\)
\(d,200+32-\left(50+32\right).\)
\(=200+32-50-32.\)
\(=\left(200-50\right)+\left(32-32\right).\)
\(=150+0=150.\)
\(e,3.\left(-2\right)^2+4.\left(-5\right)+20.\)
\(=3.4+4.\left(-5\right)+20.\)
\(=\left[3+\left(-5\right)\right]4+20.\)
\(=\left(-2\right).4+20.\)
\(=\left(-8\right)+20=12.\)
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Xem thêm câu trả lời
a) 25 - 53 : 52 + 12 : 22 b) 5 [ ( 85 - 35 : 7 ) : 8 + 90 ] - 50 c) 2. [ ( 7 - 33 : 32 ) 22 + 99 ] - 100 d) 27 : 22 + 54 : 53 . 24 - 3 . 25 e) ( 35 . 37 ) : 310 + 5 . 24 - 73 : 7 f) 32 . [ ( 52 - 3 ) : 11 ] - 24 + 2 . 103 g) ( 62007 - 62006 ) : 62006 h) ( 52001 - 52000 ) : 52000 i) ( 72005 + 72004 ) : 72004 j) ( 57 + 75 ) . ( 68 + 86 ) . ( 24 - 42 ) k) ( 57 + 79 ) . ( 54 + 56 ) . ( 33 . 3 - 92 ) l) [ ( 52 . 23) - 72 . 2 ) : 2 ] 6 - 7 . 25
Đọc tiếp
a) 25 - 53 : 52 + 12 : 22
b) 5 [ ( 85 - 35 : 7 ) : 8 + 90 ] - 50
c) 2. [ ( 7 - 33 : 32 ) 22 + 99 ] - 100
d) 27 : 22 + 54 : 53 . 24 - 3 . 25
e) ( 35 . 37 ) : 310 + 5 . 24 - 73 : 7
f) 32 . [ ( 52 - 3 ) : 11 ] - 24 + 2 . 103
g) ( 62007 - 62006 ) : 62006
h) ( 52001 - 52000 ) : 52000
i) ( 72005 + 72004 ) : 72004
j) ( 57 + 75 ) . ( 68 + 86 ) . ( 24 - 42 )
k) ( 57 + 79 ) . ( 54 + 56 ) . ( 33 . 3 - 92 )
l) [ ( 52 . 23) - 72 . 2 ) : 2 ] 6 - 7 . 25
Tính
1) (- 2) . (- 7) . (- 5) 2) 15 – 22 + ( - 17)
3) 25. (- 4) – 20. (- 5) 4) 185 – (49 + 185)
5) ( -19 ) . (- 13) + 13 . (-29)
6)79 . 23 + 21 . 23 7) 2. ( 6 . 42 – 85 : 5)
8) (-5) .8 . (-2) . 3 9) 200 +32 –( 50 +32 )
10) 3 . (-2)2 + 4 . (-5) +20
Tính
1) (- 2) . (- 7) . (- 5) 2) 15 – 22 + ( - 17)
3) 25. (- 4) – 20. (- 5) 4) 185 – (49 + 185)
5) ( -19 ) . (- 13) + 13 . (-29)
6)79 . 23 + 21 . 23 7) 2. ( 6 . 42 – 85 : 5)
8) (-5) .8 . (-2) . 3 9) 200 +32 –( 50 +32 )
10) 3 . (-2)2 + 4 . (-5) +20
1,-70 3,0 5,-130 7,158 9.150
2,-24 4,-49 6,800 8,240 10,12
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TÝnh
1) (- 2) . (- 7) . (- 5) 2) 15 – 22 + ( - 17)
3) 25. (- 4) – 20. (- 5) 4) 185 – (49 + 185)
5) ( -19 ) . (- 13) + 13 . (-29)
6)79 . 23 + 21 . 23 7) 2. ( 6 . 42 – 85 : 5)
8) (-5) .8 . (-2) . 3 9) 200 +32 –( 50 +32 )
10) 3 . (-2)2 + 4 . (-5) +20
1) (- 2) . (- 7) . (- 5)=-70
2) 15 – 22 + ( - 17)=-24
3) 25. (- 4) – 20. (- 5)=0
4) 185 – (49 + 185)=-49
5) ( -19 ) . (- 13) + 13 . (-29)=-130
6)79 . 23 + 21 . 23 =2300
7) 2. ( 6 . 42 – 85 : 5)=470
8) (-5) .8 . (-2) . 3=240
9) 200 +32 –( 50 +32 )=150
10) 3 . (-2).2 + 4 . (-5) +20=-12
(những bài như thế này thì chỉ cần bấm máy tính là ra thôi bạn nhé)
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tính nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23
tính nhanh
a/[25-(-75)]+32-(32+55)
b/25.17.(-4).125.(-8)
c/(-14).9-13.(-9)
d/37.90-37.(-10)
e/29.(100-47)+85.(47-29)
f/47.(23+50)-23.(47+50)
g/45-5.(17+9)-17.(-15)
h/(-8).(-25)+52.23
Tính
A=13/21.2/11+13/21.9/11+8/21.
B=(1-1/5).(1-2/5).(1-3/5)...(1-9/5)
C= (1-1/2).(1-1/3).(1-1/4)...(1-1/50)
D= 2²/1.3 . 3²/2.4 . 4²/3.5 . 5²/4.6 . 6²/5.7
A = 13/21.2/11 + 13/21.9/11 + 8/21
= (13/21) + (13/21) + (8/21)
= (13 + 13 + 8)/21
= 34/21
B = (1 - 1/5)(1 - 2/5)(1 - 3/5)...(1 - 9/5)
= (4/5)(3/5)(2/5)(1/5)(0/5)(-1/5)(-2/5)(-3/5)(-4/5)
= 0
C = (1 - 1/2)(1 - 1/3)(1 - 1/4)...(1 - 1/50)
= (1/2)(2/3)(3/4)(4/5)...(49/50)
= 1/50
D = (2^2/1.3) * (3^2/2.4) * (4^2/3.5) * (5^2/4.6) * (6^2/5.7)
= (4/3) * (9/8) * (16/15) * (25/23) * (36/35)
= 0.979
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1) thực hiện phép tính
a) (-3)×8×(-2)×5
b) 127-18×(5+6)
c) 125-(-75)+32-(48+32)
d) 3×(-4)×2+2×(-5)-20
Xem chi tiết
a)\(\left(-3\right).8.\left(-2\right).5=\left(-3\right).\left(-2\right).8.5\)
\(=6.40=240\)
b)\(127-18.\left(5+6\right)=127-18.11\)
\(=127-198=-71\)
c)\(125-\left(-75\right)+32-\left(48+32\right)=125+75+32-48-32\)
\(\left(125+75\right)+\left(32-32\right)-48=200-48=152\)
d)\(3.\left(-4\right).2+2.\left(-5\right)-20=-12.2+2.\left(-5\right)-20\)
\(=\left(-12-5\right).2-20=-17.2-20=-140-20=-160\)
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