tinh nhanh:
1+1+1+1+11+11+25.4+10+5+1
Những câu hỏi liên quan
2/5-2/9+2/11/7/5-7/9+7/11:1/3-1/4+1/5/7/6-7/8+7/10:tinh nhanh
Tinh nhanh:
1/3*4+1/4*5+1/5*6+........+1/9*10+1/10*11
ghi them loi giai!!!!!!!
TINH NHANH
2/3-1/4+5/11/5/12+1-7/11
1/tinh nhanh:
M=1/4+152/11+68/4>1/11
N=9/25.53/3-9/5.5.22/3
P=2/5.4.3/5.7,3/2
Q=(31/10-5/2)-3=2
TINH NHANH
2/3-1/4+5/11
5/12+1-7/11
2/3-1/4+5/11=115/132
5/12+1-7/11=103/132
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1) TINH NHANH
(75x625+175x625):(20x25x125-625x75)
2) tinh
b=1+2-3-4+5+6-7-8+9+10-11-12+..........299-330+301+302
tinh nhanh B=1/5-3/7+5/9-2/11+7/13-9/16-7/13+2/11-5/9+3/7-1/5
1.Tinh nhanh :
13 - 12 +11 +10 - 9 +8 -7 -6 +5 -4 + 3 +2 -1
Cc giup mk vs , ms sẽ tick cho
13 - 12 + 11 + 10 - 9 + 8 - 7 -6+ 5 -4 + 3 + 2 -1
= 13 - ( 12 - 11 - 10 + 9 ) + ( 8-7-6+ 5 ) - ( 4 - 3 - 2 + 1 )
= 13 - 0 + 0 -0
=13
Học tốt !
Tinh nhanh:
1-2-3-4+5-6-7-8+9-10-11-12+...+97-98-99-100
1-2-3-4+5-6-7-8+9-10-11-12+...+97-98-99-100
=(1-2-3-4)+(5-6-7-8-)+(9-10-11-12)+....+(97-98-99-100)
=(-8)+(-16)+(-24)+.....+(-200)
=(-8).(1+2+3+4+.....+25)
=(-8).325
=(-2600)