1)
120 + 1210
= 1330
2)
77 + 99 - 77 - 88 + 77
= 176 - 77 - 88 + 77
= 99 - 88 + 77
= 11 + 77
= 88
1.
120 + 1210 = 1330
2.
77 + 99 - 77 - 88 + 77 = 176 - 77 - 88 + 77
= 99 - 88 + 77
= 11 + 77
= 88
1)
120 + 1210
= 1330
2)
77 + 99 - 77 - 88 + 77
= 176 - 77 - 88 + 77
= 99 - 88 + 77
= 11 + 77
= 88
1.
120 + 1210 = 1330
2.
77 + 99 - 77 - 88 + 77 = 176 - 77 - 88 + 77
= 99 - 88 + 77
= 11 + 77
= 88
88+99+11+22+33+44+55+66+77=?
tính nhanh:
77*1111-77*99+77*4-77*4+77*98-77*100+77*93-77*81-77*12
11+22+33+44+55+66+77+88+99:100 = ?
Bài 1. Rút gọn các phân số:
28/14 ; 36/28 ; 88/77 ; 45/50 ; 120/150
Cách làm bài này
11+22+33+44+55+55+66+77+88+99
11+22+33+44+55+66+77+88+99+1010+1111+1212+1313+1414+1515+1616+.........+20162016=?
100+99+88+77+.....+7+6+5+4+3+2+1
Tinh nhanh
Ai giup mk voi
Tính nhanh
( 45+75 ) x 66 + ( 75+45 ) x 34
11+22+33+44+55+66+77+88+99:11
chung minh rang fx chia het cho gx voi fx x 99 x 88 x 77 ... x 11 1và g x x 9 x 8 ... x 1