tinh nhanh .
12.5.8.2.9=..............?
25.4.6.5=............?
175+65+35+25=.................?
25+45+75+55+100=...............?
a,(-65) + 28 + (-35) + 172
b, 34. (-65) + (-55) .34 + 34 .20
c, 168 - ( 437 + 168 ) + ( -105 + 437)
Tính nhanh:
a. - 55 . 75 + 13 (-75) . (-32)
b. 35. (65 - 24) - 65 (24 + 35)
1, tinh nhanh
35*54+35*38+65*75+65*47
Tính A= \(\frac{1}{3.7}+\frac{1}{7.14}+\frac{1}{14.21}+...+\frac{1}{140.150}\)
A=0,24x450+0,8x15x3+3x3x8/65-60+55-50+45-40+35-30+25-20+5
Tính nhanh
A = 5 + (-15) + (-25) +35 + 45 +(-55) (-65) + ....+ 2005 + (-2010)+ (-2015)
tinh bang cach hop li
-3758+(1345+8715)
(35-815)-(795-65)
3758+57-3759-66
55+66+57+58-35-36-37-38
tính
5+(-15)+(-25)+35+45+(-55)+9+(-65)+......+1995+2005
tính nhanh nha
thank you so muck
