3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27
= 135
3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27
= (3 + 27) + (6 + 24) + (9 + 21) + (12 + 18) + 15
= 30 + 30 + 30 + 30 + 15
= 30 x 4 + 15
= 120 + 15
= 135
5,4:0,4*1420+4,5*780*3/3+6+9+12+15+18+21+24+27
tính nhanh
4,5*3*780+1304*13,5
3+6+9+12+15+18+21+24+27
5,4:0,4*1420+4,5*780*3
3+6+9+12+15+18+21+24+27
5,5:0,4*1420+4,5*780*3/3+6+12+15+18+21+24+27
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30=
60 + 57 + 54 + 51 + 48 + 45 + 42 + 39 + 36 + 33 + 30 + 27 + 24 + 21 + 18 + 15 + 12 + 9 + 6 + 3 = ?
Tính nhanh lên! Chỉ có 3 phút thôi đó!
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+149+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39*100
bài toán 1 : tính nhanh
5,4 : 0,4 x 1420 + 4,5 x 780 x 3
3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27
(5,4 : 0,4 x 1420 + 4,5 x 780 x 3) : ( 3 + 6+9+12+15+18+21+27)
Tính nhanh
