1)
a) `27/35 . 12/17 + 27/35 . 5/17 + 8/35`
`= 27/35 ( 12/17 + 5/17) +8/35`
`= 27/35 . 1 + 8/35`
`= 27/35 + 8/35`
`= 35/35`
`=1`
b) `-8/7 . 5/3 + 5/3 .1/7`
`= 5/3 (-8/7 + 1/7)`
`= 5/3 . (-1)`
`=-5/3`
2)
a) `(x-1/3)^2=9`
+) `(x-1/3)^2 = 3^2`
`=> x-1/3=3`
`=>x= 3 + 1/3`
`=> x= 9/3 +1/3`
`=>x=10/3`
+) `(x-1/3)^2 =(-3)^2`
`=> x-1/3=-3`
`=> x=-3 +1/3`
`=> -9/3 + 1/3`
`=>x =-8/3`
Vậy `x=10/3` hoặc `x=-8/3`
`1)`
`a) 27/35 . 12/17 + 27/35 . 5/17 + 8/35`
`= 27/35 . ( 12/17 + 5/17) + 8/35`
`= 1`
$\\$
`b) -8/7 . 5/3 + 5/3 . 1/7`
`= (-8/7 + 1/7) . 5/3`
`= (-1) . 5/3`
`= -5/3`
`2)`
`a) ( x - 1/3)^2 = 9`
`( x - 1/3)^2 = (+-3)^2`
⇒ `x - 1/3 = 3` hoặc `x - 1/3 = -3`
`x = 3 + 1/3` hoặc `x = -3 + 1/3`
`x = 10/3` hoặc `x = -8/3`
Vậy `x∈ { 10/3 ; -8/3}`
Giải giúp em với ạ em cảm ơn trc
Giải giúp em với ạ em cảm ơn trc ạ
tìm x: a, (2x-5)^3=216 b, 2x-3 chia hết cho x+4( với x thuộc z) c,|x-18|-2x+14=47 d,1 phần 6+ 5 phần 6:x = 7 phần12
tính:a,27^64: 81^20 b,(1 phần 8)^20:( 1 phần 16)^9 c, 1 phần 3: 1 phần 5- 1 phần 6 d, 8 phần 15 - 8 phần 31- 8 phần 47+ 8 phần 59 trên -1+15 phần 31+ 15 phần 47- 15 phần 59 mọi người ơi, giúp mik với...
Helppppppppppppppppppppppppppppppppppppp
Cho∆ABC vuông tại A phân giác BD và CE cắt nhau tại I cm BD.CE=2BI.CI
Tính nhanh 5/11+1/4+2/5+6/11+3/4+6/25+9/25
VII. Put the verbs in brackets in the correct tense forms to complete the sentences. 1. You (wait)……………………for her when her plane arrives tonight? 2. Don’t phone me between 7 and 8. We (have)…………………dinner then. 3. I (send)…………………….in my application tomorrow. 4. Next week at this time, you (lie)………………….on the beach. 5. You (meet)………………….your former teachers at 9 a.m tomorrow morning, won’t you? 6. The tourists (go)……………………..sight-seeing in the country all next week. 7. You soon (tell)……………………..what to do next. 8. The boy (teach)………………………..how to swim when he grows up. 9. You (give)…………………….a prize if you come first in the examination. 10. We (still sail)…………………..through the Red Sea when you arrive at Cairo. VIII. Complete the sentences with the correct form of the verbs in Future Tenses (be going to + V/ future simple or future continuous) 1. They (fly)_____________ to New York next summer holidays. 2. We (observe)_____________ Mars from the National Space Center at this time next week. 3. People (travel)_____________ by flying car in the future. 4. Japan (build)________________ a robotic moon base by 2020, built by robots, and for robots. 5. China (connect)______________ Beijing to London with a high-speed railway soon. 6. They (test)_____________the latest model of Iphone at 9 o’clock tomorrow. 7. I think they (invent)___________ a new building material next week. 8. According to the approval, they (develop)____________ a new medicine in May. 9. At this time nexr year, scientists (explore)______________ the environment of some planet. 10. Due to the plan, Ms Oven (be)_____________ the special guest speaker this Friday morning. awww giúp em với, em cảm ơn nhìu nhìu ạ ^w^~~
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