2 phần 3 - 1 phần 4+ 5 phần 11
5 phần 12+ 1- 7 phần 11. tính nhanh
TINH NHANH
2/3-1/4+5/11/5/12+1-7/11
TINH NHANH
2/3-1/4+5/11
5/12+1-7/11
tinh nhanh\(P=\frac{\frac{2}{3}-\frac{1}{4}+\frac{5}{11}}{\frac{5}{12}+1+\frac{7}{11}}\)
a)11/53+(32/47+-10/53)+-64/94+1/53+1/3
b) (-1+45/115+47/51)+(-9/23+-1/3)
c) -13/49+12/48+1/12+3/18
d) 13/15+(-4/5+7/18)+-5/12+1/16
tinh nhanh
a,A=100+98+96+...+2-97-95-...-1
b,B=1+2-3-4+5+6-7-8+9+10-11-12+...-229-330+301+302
c,C=41*66+34*41/3+7+11+...+79
d,D=1+2+3+...+200/6+8+10+...+34
e,E=1*5*6+2*10*12+20*24*4+9*45*54/1*3*5+2*6*10+4*12*20+9*27*45
Tinh nhanh \(P=\frac{\frac{2}{3}-\frac{1}{4}+\frac{5}{11}}{\frac{5}{12}+1-\frac{7}{11}}\)
tinh nhanh (viet ho minh luon cach lam nha)
a=1-3+5-7+9 -11+...+49-51
b=-1+4-5+8-9+12-...-53+56
c=1+3-5-7+9+11-...-397-399
d=1-2-3+4+5-6-7+...+97-98-99+100
1, Tinh hop ly
12-12+11+10+-9+8-7+5-4+3+2-1=????
Giúp mình nha !