tính nhanh:
503 x 102
tính nhanh
2003 x 14 + 1988 + 2001 x 2002
2002 + 2002 x 503 + 504 x 2002
P=\(\frac{\left(2002+1\right)\times14+1988+2001\times2002}{2002\times\left(1+503+504\right)}\)
\(=\frac{2002\times14+2002+2001\times2002}{2002\times1008}\)
\(=\frac{2002\times\left(14+1+2001\right)}{2002\times1008}=\frac{2016}{1008}=2\)
tính nhanh
2003 x 14 + 1998 + 2001 x 2002
2002 + 2002 x + 503 + 504 x 2002
Tính nhanh A:
A = 2003 x 14 + 1988 + 2001 x 2002
2002 + 2002 x 503 + 504 x 2002
2012 x 20 - 1006 x 18 x 2 - 503 x 4
2012+2011 x a x (2012 - 503 x 4 ) + 2012 x 9
tinh nhanh nha mg dung m tich nha
a = 2012 * 20 - 1006 * 2 * 18 - 503 * 4
= 2012 * 20 - 2012 * 18 - 2012
= 2012* 20 - 2012 * 18 - 2012 *1
= 2012* ( 20-18-1)
= 2012* 1 = 2012
Đây nek
thank ban phuong pham nha
tính nhanh: 2003*14+1988+2001*2002/2002+2002*503+504*2002
Tính nhanh:
a) 33.55+ 33.67 +45.33+ 67 2 ;
b) -64+ 104 3 - 12 . 104 2 + 48 . 104 - 50 3 ;
c) 2016.2018- 2017 2 .
Tính nhanh:
102 x 8,6 - 17,2 + 25 x 5,6
Lời giải:
$=102\times 8,6-8,6\times 2+25\times 4\times 1,4$
$=8,6\times (102-2)+100\times 1,4$
$=8,6\times 100+140=860+140=1000$
Tính nhanh 456: 2 x 18 + 456: 3 - 102
`@` `\text {Ans}`
`\downarrow`
`456 \div2\times18 + 456\div3 - 102`
`= 456\times0,5\times18 + 456\times1/3 - 102`
`= 456\times (0,5 \times 18 + 1/3) - 102`
`= 456 \times(9 + 1/3) - 102`
`= 456 \times28/3 - 102`
`= 4256 - 102`
`= 4154`
=456*9+456:3-102
=4104+152-102
=4104+40
=4144
Tính nhanh:
194 x 102 - 109 - 4 - 180 - 14
\(194\times102-109-4-180-14\)
\(=19788-109-4-180-14\)
\(=19679-4-180-14\)
\(=19679-\left(4+1880+14\right)\)
\(=19679-198\)
\(=19481\)
tính nhanh : ( 145 x 99 + 145 ) - ( 143 x 102 - 143 )
(145 x 99 + 145) - (143 x 102 - 143)
=(145 x (99+1) - (143 x (102-1)
=(145 x 100) - (143 x 101)
=14500 - 14443
=57
Chúc bạn học tốt .