\(=49+540-920:230=589-4=585\)
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Tính tổng:A=2-4+6-8+10-...-2016
B=2-4-6+8+10-12-14+16+...+2008
200 - 2 ( x + 6 ) = 14; 3 ( x + 5 ) + 7 = 64; 50 - 3 ( x + 1 ) = 23; 6 x + 2 nhân x = 24 + 16
a) 2-4+6-8+...+1998+2000
b) 2-4-6+8+10-12-14+16+...+1994-1996-1998+2000
a) 2-4+6-8+...+1998+2000
b) 2-4-6+8+10-12-14+16+...+1994-1996-1998+2000
a) 2-4+6-8+...+1998+2000
b) 2-4-6+8+10-12-14+16+...+1994-1996-1998+2000
a) 2-4+6-8+...+1998+2000
b) 2-4-6+8+10-12-14+16+...+1994-1996-1998+2000
a) 2-4+6-8+...+1998+2000
b) 2-4-6+8+10-12-14+16+...+1994-1996-1998+2000
a) 2-4+6-8+...+1998+2000
b) 2-4-6+8+10-12-14+16+...+1994-1996-1998+2000
TÍNH NHANH:
(-2)+4+(-6)+8+........+(-18)+20
2-4-6+8+10-12-14+16..........+1994-1996-1998+2000