18x1230+9x4567x2+3x5310x6
(18x123+9x4567x2+3x5310x6):(1+4+7+10....+55+58-490) =?
18x123+9x4567x2+3x5310x6
[2+4+6+8+...+18+20+22]+48
18 x 123 + 9 x 4567 x 2 + 3 x 5310 x 6
= 18 x 123 + 18 x 4567 + 18 x 5310
= 18 x (123 + 4567 + 5310)
= 18 x 10000
= 180000
18.123+9.4567.2+3.5310.6
=18.123+9.2.4567+3.6.5310
=18.123+18.4567+18.5310
=18.(123+4567+5310)
=18.10000=180000
DẤU CHẤM LÀ NHAN NHÉ !
( 2+4+6+...+18+20+22) + 48
= (22+2).[(22-2):2+1] : 2 + 48
= 132 + 48
= 180
phần a bn lm như mấy bn kia nha\
1. Tính nhanh
a) 2006x125+1000 phần 126x2005-888
b) 18x123+9x4567x2+3x5310x6 phan 1+4+7+10+...+49+52+55+58-410
Tính Nhanh ( chữ x trog bài b là dấu nhấn )
a) \(\dfrac{2+4+6+8+...+82+84}{4+7+10+13+...+130+133}\)
b) \(\dfrac{18x123+9x4567x2+3x5310x6}{\left(2+4+6+...+20+22\right)+48}\)
a: Đặt A=2+4+...+82+84
Số số hạng là (84-2):2+1=42(số)
Tổng là (84+2)*42/2=1806
Đặt B=4+7+...+130+133
Số số hạng là (133-4):3+1=44(số)
Tổng là (133+4)*44/2=3014
=>C=1806/3014=903/1507
b: \(=\dfrac{18\left(123+4567+5310\right)}{132+48}=\dfrac{18\cdot10000}{180}=1000\)
a,2006x2005-1/2004x2006+2005 b,45x45+45x55/1+3+5+.......+19 c,7256x4375-725/3650+4375x7255
d,35x12+65x13 g,18x123+9x4567x2+3x5310x6
a,2006x2005-1/2004x2006+2005 b,45x45+45x55/1+3+5+.......+19 c,7256x4375-725/3650+4375x7255
d,35x12+65x13 g,18x123+9x4567x2+3x5310x6
a,2006x2005-1/2004x2006+2005 b,45x45+45x55/1+3+5+.......+19 c,7256x4375-725/3650+4375x7255
d,35x12+65x13 g,18x123+9x4567x2+3x5310x6
a,2006x2005-1/2004x2006+2005 b,45x45+45x55/1+3+5+.......+19 c,7256x4375-725/3650+4375x7255
d,35x12+65x13 g,18x123+9x4567x2+3x5310x6
a,2006x2005-1/2004x2006+2005 b,45x45+45x55/1+3+5+.......+19 c,7256x4375-725/3650+4375x7255
d,35x12+65x13 g,18x123+9x4567x2+3x5310x6