40+60+90+10+500
=(40+60)+(90+10)+500
= 100 +100+500
= 700
40 + 60 + 90 + 10 + 500
= (40 + 60) + (90 + 10) + 500
= 100 + 100 + 500
= 100 . 2 + 500
= 200 + 500
= 700
40 + 60 + 90 + 10 + 500
=100 + 100 + 500
=200 + 500
=700
40+60+90+10+500
=(40+60)+(90+10)+500
= 100 +100+500
= 700
40 + 60 + 90 + 10 + 500
= (40 + 60) + (90 + 10) + 500
= 100 + 100 + 500
= 100 . 2 + 500
= 200 + 500
= 700
40 + 60 + 90 + 10 + 500
=100 + 100 + 500
=200 + 500
=700
Tìm x
30 + x = 40 + 60
10 + 90 = 40 + x
Tìm x
20 + x = 40 + 60
10 + 90 = 40 + x
31+40+50+60+70+80+90+10+12+13+14+15x12x1x4x5x6x78x9
C={10; 20; 30; 40; 50; 60; 70; 80; 90}. chỉ ra tính chất đặt trưng
47 + 50 + 3 + 100 + 20 + 80 + 40 + 60 + 10 + 90 = ?
_Ai nhanh-mk k_
60+40+55+45+10+90
k mk mk k lai
the lun
tính nhanh tổng: M=1/10+4/20+9/30+16/40+25/50+36/60+49/70+64/80+81/90
Tìm x biết: \(\frac{x+10}{90}+\frac{x+20}{80}+\frac{x+30}{70}+\frac{x+40}{60}+\frac{x+50}{50}\)
Tìm x biết: \(\frac{x+10}{90}+\frac{x+20}{80}+\frac{x+30}{70}+\frac{x+40}{60}+\frac{x+50}{50}=-5\)