Tính nhanh :
10 + 20 + 30 + 40 + .... + 50 + 60 + 70 + 80 + 90 + 100
TÍNH:
40+1230=....... 67478+9076=...............
1230+40=........ 9076+67478=...............
TÍNH NHANH
10+20+30+40+50+60+70+80+90+100
=...................................................
=...................................................
=................................................
Tính nhanh :
\(A=10+20+30+40+50+60+70+80+90\)
10 + 20 + 30 + 40 +50 +60 +70 +80 +90 +100 = ???
tick mk , mk tick cho
Tính nhanh : 1/10 + 4/20 + 9/30 + 16/40 + 25/50 + 36/60 + 49/70 + 64/80 + 81/90
tính nhanh
50 + 60 + 80 + 70 + 90 + 10 + 100 + 20 + 30 + 50
Tính nhanh:
1/10+2/20+3/30+4/40+5/50+6/60+7/70+8/80+9/90=?
10 +20 +30 +40 +50 + 60+ 70 +80 +90 = ?
10+20+30+40+50+60+70+80+90+100=???????????????????????????????????????????