11X4+50-20:30X19+64 = ?
35x34:54-32+12 = ?
Tính nhanh
50 - 52 + 40 - 42 + 30 - 32 + 20 - 22 +10 - 12 + 60
tính nhanh:
20 + 20 + 20 + 20 + 20 + 50 + 50 + 50 + 50=
tìm x :
\(x+50-20=50+20\)
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+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50.
x + 20 = 20 + 50+ 50
Tính nhanh
20×50+20×50
x + 20 = 50 + 50 + 50
x + 50 = 20 + 50