(516 + 165) . (317 - 310) . (24 - 42)
= (152587890625 + 1048576) . (129140163 - 59049) . (16 - 16)
= 152588939201 . 129081114 . 0
= 0
[( 5^16+4^16) . 3^17 3^10 ] .(2^4- 4^2)
\(\left(5^{16}+16^5\right)\left(3^{17}-3^{10}\right)\left(2^4-4^2\right)\)
tính nhanh.
Tính (nhanh nếu có thể)
[(5^16+4^16).3^17-3^10].(2^4-4^2)
1) -145.(13 - 57) + 57.(10 -145)
2) 17.(15 - 16) + 16.( 17- 20)
3) -38.(25 - 4) + 25.(-4 + 38 )
4) 23.(145 - 17) - 145.(23 - 6)
5) 24.(15 - 4) + 4.(24 - 15)
6) 199.(15 - 17) - 199.(-17 + 5)
7) -39.(5 - 99) + 99.(10 - 39)
Tính hợp lí
1) -145.(13 - 57) + 57.(10 -145)
2) 17.(15 - 16) + 16.( 17- 20)
3) -38.(25 - 4) + 25.(-4 + 38 )
4) 23.(145 - 17) - 145.(23 - 6)
5) 24.(15 - 4) + 4.(24 - 15)
6) 199.(15 - 17) - 199.(-17 + 5)
7) -39.(5 - 99) + 99.(10 - 39)
Tìm số nguyên x, biết:
1) -16 + 23 + x = - 16
2) 2x – 35 = 15
3) 3x + 17 = 12
4) (2x – 5) + 17 = 6
5) 10 – 2(4 – 3x) = -4
6) - 12 + 3(-x + 7) = -18
Tính hợp lí
a, 387 . 2694 + 7305 . 387 + 387
b, ( 5^16 + 16^5 ) ( 3^17 - 3^10 ) ( 2^4 - 4^2 )
c, ( 5^2007 - 5^2006 ) : ( 5^2005 . 5 )
a ) 3^6 : 3^4 + 2^2x(12-3^3) - 2^0
b) 5^3 x 52 + 5^3 x7 - 5^3
c) 5^3 + ( 4 + 3^4) x2 + (3^3 - 3 ) : 4
d) (2x25x7 - 21x15) : 7
e) 5 x [(92+ 2^5 : 2^2 ) : 5^2 + 2^4 ] - 7^2
f ) ( 5^16 + 4^16) x 3^17 - 3^10 ) x ( 2^4 - 4^2 )
câu 3: rút gọn rồi quy đồng
a, 12/36 và -16/ 20 b, 21/ 105 và 35/ 150
Câu 4:
a, 3/10 + 5/10 b, [-27] . 36+ 64 . [-27] + 23 . [ -100]
c, 5/8 + 3/ 12 d, -2/17 + 3/19 + -15/ 17 + 16/19 + 5/6