Tính gtbt
x7-26x6+27x5-47x4-77x3+50x2+x-24 tai x=24
Cho C= x7-26x6+27x5-47x4-77x3+50x2+x-24
tính C khi x=25
Thay x = 25 vào C, ta có:
\(C=25^7-26\cdot25^6+27\cdot25^5-47\cdot25^4-77\cdot25^3+50\cdot25^2+25-24=-28144\)
Bài 3: Tính giá trị của biểu thức sau bằng cách hợp lý:
a/ A = x5 – 100x 4 + 100x3 – 100x2 + 100x – 9 với x = 99
b/ B = x6 – 20x5 – 20x4 – 20x3 – 20x2 – 20x + 3 với x = 21
c/. C = x7 – 26x6 + 27x5 -47x4 – 77x3 + 50x2 + x – 24 với x = 25
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Tính nhanh
24 x 5 + 24 x 3 + 24 x 2
* 24 x 5 + 24 x 3 + 24 x 2
= 24 x (5 + 3 + 2)
= 24 x 10
= 240
240 NHÉ -...-
DỄ THẾ CŨNG HỎI
24 x 66 -24 + 36 x 24 tính nhanh
24 × 66 - 24 + 36 × 24
= 24 × (66 - 1 + 36)
= 24 × 101
= 24 × (100 + 1)
= 24 × 100 + 24
= 2400 + 24
= 2424
\(..=24x\left(66-1+36\right)=24.\left(65+35+1\right)=24.\left(100+1\right)=2400+24=2424\)
\(24\times66-24+36\times24=24\times\left(66-1+36\right)\)
\(=24\times101\)
\(=2424\)
Tính nhanh
a) (24 x 6 + 4 x 24) : ( 49 - 24 x 2)
b) 51 x 2 x 3 x 5
1. tính giá trị biểu thức
a) 48048 - 48048 : 24 - 24 x 58 =
b) 10000 - ( 93120 : 24 - 24 x 57 ) =
c) 100798 - 9894 : 34 x 23 - 23 =
`a) 48048 - 48048 : 24 - 24 x 58 `
` = 48048 - 2002- 1392`
` = 46046 - 1392`
` = 44654`
b) 10000 - ( 93120 : 24 - 24 x 57 )
` = 10000 - ( 3880 - 1368)`
` = 10000 - 2512`
` = 7488`
c) 100798 - 9894 : 34 x 23 - 23 =
` = 100798 - 6693 -23`
` = 94082`
a: =48048-2002-1392=44654
b: =10000-3880+1368=7488
c: =100798-6693-23=94082
tính nhanh biểu thức sau :
24 x 34 + 24 x 34 + 24 x 37
24 x 34 + 24 x 34 + 24 x 37
=24 x ( 34 + 34 + 37 )
= 24 x 100
= 2400
24x(34+34+37) = 2520
hoặc
2x24x34 + 24x37 = 2520
bieu thuc B= /4x-8/^6+(x-4)^24+9 dat gia tri nho nhat tai x =
ai nhanh ma dung mik tick cho
bieu thuc B= /4x-8/^6+(x-4)^24+9 dat gia tri nho nhat tai x =
ai nhanh ma dung mik tick cho
bieu thuc B= /4x-8/^6+(x-4)^24+9 dat gia tri nho nhat tai x =
ai nhanh ma dung mik tick cho