a) 34 * 32002 = 1088068
b) 89 * 1998 = 177822
c) 105 * 16 = 1680
d) 49 * 101 = 4949
a) 34 * 32002 = 1088068
b) 89 * 1998 = 177822
c) 105 * 16 = 1680
d) 49 * 101 = 4949
(1+2+3+4...+999+1000)><(105><102-105><101-45-60)
23+45+34+67+89+14+67+69+34=
50:50+89-34=
a \(\frac{101+102+103+104}{102+103+104+105}\) SO SÁNH A VÀ B B \(\frac{101+102+103+104}{102+103+104+105}\)
tinh bang 2 cach
789 x 49 437 x 28
89 x72 691 x 28
Bài 1: Tính nhanh
A, 13 x 126 + 37 x 126 - 49 x 126
B, ( 1 + 2 + 4 + 8+.....+ 512 ) x ( 101 x 102 - 101 x 101 - 50 - 51 )
Tính
a . 7 12 + 3 4 × 2 9 b . 8 9 - 4 15 : 2 5
12*23*34*45*56*67*78*89
>;<;=
989.......1321
27 105..........7985
8 300 : 10 ..........830
34 579 ............... 34 601
150 428 ...........150 459
72 600..............726 100