(73+75)x(54+ 56) x (33x3-92)
thực hiện phép tính
a, (35* 37) : 310+ 5 * 24- 73 : 7
b, (75+ 79)* (54+56)*((33*3-92)
a) (3⁵ . 3⁷) : 3¹⁰ + 5 . 2⁴ - 7³ : 7
= 3¹² : 3¹⁰ + 5.16 - 7²
= 3² + 80 - 49
= 9 + 31
= 40
b) (7⁵ + 7⁹) . (5⁴ + 5⁶) . (3³.3 - 9²)
= (7⁵ + 7⁹) . (5⁴ + 5⁶) . (81 - 81)
= (7⁵ + 7⁹) . (5⁴ + 5⁶) . 0
= 0
Tính giá trị biểu thức một cách hợp lí
1) B = 5 − 3 4 + 1 5 − 6 + 7 4 − 8 5 − 2 − 5 4 + 16 5
2) C = − 2 3 + 1 − 7 5 − 0 , 2 + 7 15 − 1 + 4 3
3) D = − 0 , 25 − − 3 4 − − 7 3 + − 9 2 − 5 6
4) E = 1 − 2 5 − 4 3 − 0 , 8 − 1 − 1 , 4 + 2
bài 1: rút gọn
a, 73 . 75
b, 56. 54
a) \(7^3.7^5=7^{3+5}=7^8\)
b)\(5^6.5^4=5^{6+4}=5^{10}\)
a) (75 + 79).(54 + 56).(33.3 – 92) | b) [(52.23) – 72.2) : 2].6 – 7.25 |
a) \(\left(7^5+7^9\right)\left(5^4+5^6\right)\left(3^3.3-9^2\right)=\left(7^5+7^9\right)\left(5^4+5^6\right)\left[3^4-\left(3^2\right)^2\right]=\left(7^5+7^9\right)\left(5^4+5^6\right)\left(3^4-3^4\right)=\left(7^5+7^9\right)\left(5^4+5^6\right).0=0\)
3 54 x 73 + 0 46 x 25 + 3 54 x 26 + 0 46 x 75 + 3 54
giúp với
\(3,54\times73+0,46\times25+3,54\times26+0,46\times75+3,54\)
\(=3,54\times\left(73+26+1\right)+0,46\times\left(25+75\right)\)
\(=3,54\times100+0,46\times100\)
\(=354+46=400\)
3,54 x 73 + 0,46 x 25 + 3,54 x 26 + 0,46 x 75 + 3,54
= 3,54 x ( 73 + 26 + 1 ) + 0,46 x ( 25 + 75 )
= 3,54 x 100 + 0,46 x 100
= 100 x ( 3,54 + 0,46 )
= 100 x 4
= 400
Vậy biểu thức trên có giá trị là 400 nhé !
bài 1 tìm giá trị nhỏ nhất
A= (x+1)^2-3
Bài 2 tính hợp lí
a)-54-55-56+74+75+76
b)(27-514)-(-73+486)
Bài 3 tìm x
-12+x=-(x-66)
b1:bỏ ngoặc rồi tinh hợp lí
1) -( -66)+34+(-73)-27+99 2)54-(45-30+54)-30+5 3)42-56+33-(33-56+42)
4)50-(47+50-18)+(47-18) 5) |25-24-10|-(28-30+4) 6)-(-73)+(44-94+27)+94
7) (-33+180-75)-(180+25) 8)120-(-92+120-18)-92
B2:tìm x biết
1)x+18=6-2x 2)17-x=7-6x 3)x+15=20-4x 4)7x-4=20+3x 5)-12+x=5x-20 6)4x-18=x+27
7) 2.(x-5)-3.(x+7)=14 8)5.(x-6)-2.(x+3)=12 9)-7.(5-x)-2.(x-10)=15 10)3. ( x - 4 ) - ( 8 - x )=12
11)4.(x-5)-(x+7)=-19 12)7.(x-3)-5.(3-x)=11x-5
B2:tìm x biết
1)x+18=6-2x
<=> 3x=-12
<=> x= -4
2)17-x=7-6x
<=>5x=-10
<=>x=-2
3)x+15=20-4x
<=>5x=5
<=>x=1
4)7x-4=20+3x
<=> 4x=24
<=>x=6
5)-12+x=5x-20
<=>4x=8
<=>x=2
6)4x-18=x+27
<=>3x=45
<=>x=9
7) 2.(x-5)-3.(x+7)=14
<=>2x-10-3x-21=14
<=>-x=14+10+21=45
<=>x=-45
8)5.(x-6)-2.(x+3)=12
<=>5x-30-2x-6=12
<=>3x=48
<=>x=12
9)-7.(5-x)-2.(x-10)=15
<=>-35+7x-2x+20=15
<=>5x=30
<=>x=6
10)3. ( x - 4 ) - ( 8 - x )=12
<=>3x-12-8+x=12
<=>4x=32
<=>x=8
11)4.(x-5)-(x+7)=-19
<=>4x-20-x-7=-19
<=>3x=8
<=>x=8/3
12)7.(x-3)-5.(3-x)=11x-5
<=>7x-21-15+5x=11x-5
<=>x=31
b1:bỏ ngoặc rồi tinh hợp lí
1) -( -66)+34+(-73)-27+99=66+34-73-27+99 =100-100+99=99
2)54-(45-30+54)-30+5=54-45+30-54-30+5=-45+5=-40
3)42-56+33-(33-56+42)=42-56+33-33+56-42=0
4)50-(47+50-18)+(47-18)=50-47-50+18+47-18=0
5) |25-24-10|-(28-30+4)=9-28+30-4=39-32=7
6)-(-73)+(44-94+27)+94=73+44-94+27+94=100+44=144
7) (-33+180-75)-(180+25)=-33+180-75-180-25=-100-33=-133
8)120-(-92+120-18)-92=120+92-120+18=108
b1:bỏ ngoặc rồi tinh hợp lí
1) -( -66)+34+(-73)-27+99=66+34-73-27+99 =100-100+99=99
2)54-(45-30+54)-30+5=54-45+30-54-30+5=-45+5=-40
3)42-56+33-(33-56+42)=42-56+33-33+56-42=0
4)50-(47+50-18)+(47-18)=50-47-50+18+47-18=0
5) |25-24-10|-(28-30+4)=9-28+30-4=39-32=7
6)-(-73)+(44-94+27)+94=73+44-94+27+94=100+44=144
7) (-33+180-75)-(180+25)=-33+180-75-180-25=-100-33=-133
8)120-(-92+120-18)-92=120+92-120+18=108
Tính hợp lý
a) 54+3019+5989+145
B) 3767-563-140-297
C) 56 x 73 +56x17+44x90
a) 54+3019+5989+145
=(54+145)+(3019+5989)
=190+9008
=9198
b)
3767-563-140-297
=(3767-297)-(563-140)
=3470-423
=3047
c) 56x(73+17)+44x90
=56x90+44x90
=(56+44)x90
=100x90
=9000
Chúc bạn học tốt.Nhớ k cho mình nhé
c) 56 x 73 + 56 x 17 + 44 x 90
= 56 x ( 73+17) + 44 x 90
= 56 x 90 + 44 x 90
= 90 x ( 56 + 44 )
= 90 x 100
= 9000
1 * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 * 11 * 12 * 13 * 14 * 15 * 16 * 17 * 18 * 19 * 20 * 21 * 22 * 23 * 24 * 25 * 26 * 27 * 28 * 29 * 30 * 31 * 32 * 33 * 34 * 35 * 36 * 37 * 38 * 39 * 40 * 41 * 42 * 43 * 44 * 45 * 46 * 47 * 48 * 49 * 50 * 51 * 52 * 53 * 54 * 55 * 56 * 57 * 58 * 59 * 60 * 61 * 62 * 63 * 64 * 65 * 66 * 67 * 68 * 69 * 70 * 71 * 72 * 73 * 74 * 75 * 76 * 77 * 78 * 79 * 80 * 81 * 82 * 83 * 84 * 85 * 86 * 87 * 88 * 89 * 90 * 91 * 92 * 93 * 94 * 95 * 96 * 97 * 98 * 99 * 100 bằng bao nhiêu?
27 x 54 + 46 x 27 + 73 x 65 + 35 x 73
27 x 54 + 46 x 27 + 73 x 65 + 35 x 73
= ( 54 + 46 ) x 27 + ( 65 + 35 ) x 73
= 100 x 27 + 100 x 73
= ( 27 + 73 ) x 100
= 100 x 100
= 10000
Vậy kết quả là 10000 .
27x54+46x27+73x65+35x73
=27x(54+46)+73x(65+35)
=27x100+73x100
=2700+7300
=10000