x + 24 = 78 - 54
4 + 14 + 24 + 34 + 44 + 54 + 64 + 74 +84 + 94 + 100 = ?
Tìm x :
x - 24 = 54
8 - x = 6
24 + x = 94
77 + x = 90
45+54+15+55=?
Tính
A. 61+24+15
B. 61+24-15
C. 61-24+15
D. 61-24-15
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+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
1: Tìm X:
X - 24 = 45 54 + X = 65
12+54=
65+16=
98+24=
90+10=
62+99=
78+20=
Bài 1: Điền dấu +- vào dấu chấm
26...16 =42
54...24 =30
39...11 =50
70...20 =50