4/5×7+4/7×9+4/9×11+...+4/53×55

Where is đề bài ???? 5:()

1.tính A.-5/8-7/-12 B.3/4+(-5)/6-11/-12 C.1/6-1/36 D.15/48-(-5)/12 E.-1/7-1/8 F.-5/15-(-3)/25 G.3/4-(-5)/12-7/-24

1.You (watch) a football match last night ? 2.There (be) an interesting film on TV last Sunday. 3.My brother usually (do) his homework before school. 4.I (not) (meet) my brother 2 week ago. 5.She (washing) the dishes every day ?

1.Mai's house is more beautiful yhan Nam's house. =>Nam's house 2.No body in my family is more intellegent than me. => I

Chứng tỏ rằng A chia hết cho 6 với A=2+2²+2³+2⁴+....+2¹⁰⁰

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