1. tính nhanh
34^2 + 66^2 + 68 * 66
Tính nhanh:
a. 34^2 + 66^2 + 68 x 66
b. 74^2 + 24^2 - 48 x 74
a. 34^2 + 66^2 + 68 x 66
= 34 x 34 + 66 x 66 + 68 x 66
= 34 x 34 + 66 x (66 + 68)
= 34 x 34 + 66 x 134
= 34 x 34 + 66 x 34 + 66 x 100
= 34 x (34 + 66) + 66 x 100
= 34 x 100 + 66 x 100
= (34 + 66) x 100
= 100 x 100
= 10000
\(34^2+66^2+68.66\)
\(=34.34+66.66+68.66\)
\(=34.34+66.\left(68+66\right)\)
\(=34.34+66.134\)
\(=34.34+66.\left(100+34\right)\)
\(=34.34+66.100+66.34\)
\(=34.\left(66+34\right)+66.100\)
\(=34.100+66.100\)
\(=\left(34+66\right).100\)
\(=100^2\)
\(=10000\)
Tính nhanh:
a) 34^2 + 66^2 + 68 . 66
b) 74^2 + 24^2 – 48 . 74.
( 34^2+66^2+68.66
= 34^2 + 66^2 + 2. 34.66
= ( 34+66)^2
= 100^2 = 10 000
b) 74^2 + 24^2 - 48.74
= 74^2 + 24^2 - 2. 74 . 24
= (74-24)^2 = 50^2 = 2500
a) 34^2 + 66^2 + 68 . 66 = 5580,66
b) 74^2 + 24^2 – 48 . 74 = 6003.26
a, = 34^2 + 66^2 + 2.34.66
= (34+66)^2 = 100^2 = 10000
b, = 74^2+24^2-2.24.74
= (74-24)^2 = 500^2 = 250000
Tk mk nha
Tính nhanh
342+ 662 + 68.66
tính nhanh 342+662+68*66
342 + 662 + 68.66
= 342 + 2.34.66 + 662
= (34 + 66)2
= 1002
= 10000
tính nhanh :
a) 342 + 662 + 68 .66
b) 742 + 242 - 48 . 74
Tính nhanh :
a/ 34^2 + 66^2 + 68 . 66
b/ 74^2 + 24^2 - 48 . 74
giải zùm tớ nkan m.n
a/ 34^2 + 66^2 + 68 . 66
=342+2.34.66+662
=(34+66)2
=1002
=10000
b/ 74^2 + 24^2 - 48 . 74
=742-2.74.24+242
=(74-24)2
=502
=2500
\(a,34^2+66^2+68.66\)
\(=34^2+2.34.66+66^2\)
\(=\left(34+66\right)^2\)
\(=100^2\)
\(=10000\)
\(b,74^2+24^2-48.74\)
\(=74^2-2.74.24+24^2\)
\(=\left(74-24\right)^2\)
\(=50^2\)
\(=2500\)
1) tính nhanh
a)342+662+68.66
b)742+242-48.74
a) 342+662+68.66=342+662+2.34.66
=(34+66)2=1002=10000
b)742+242-48.74=742+242-2.24.74
=(74-24)2=502=2500
Tính nhanh:
a) 342 + 662 + 68 . 66
b) 742 + 242 – 48 . 74
a) \(34^2+66^2+68.66\)
\(=34^2+2.34.66+66^2\)
\(=\left(34+66\right)^2\)
\(=100^2=10000\)
b) \(74^2+24^2-48.74\)
\(=74^2-2.74.24+24^2\)
\(=\left(74-24\right)^2\)
\(=50^2=2500\)
(5-2x^2)(5+x^2)
(2x-y)(4x^2+2xy+y^2)
(x+3)(x^2-3x+9)
Tinh nhanh
34^2+66^2+68×66
74^2+24^2-48×74