153º;19′42〃+26º;40′18〃=
179°59′60〃
153°19′42〃+26°40′28〃
189度9‘10”
四十又十七分之十五减四十二又十九分之十八减去八十三又十七分之十五的絕對值
八十五又19分之18
32.68°+28°41′55〃
90°-48°10′22〃
28°29′30〃*5
32.68°+28°41′55〃
=32°40'48''+28°41′55〃
=60°81′103〃
=61°22′43〃
90°-48°10′22〃
=89°59‘60’‘-48°10’22‘’
=51°49‘38’‘
28°29′30〃*5
=140°145′150〃
=142°27′30〃
計算15°42’12”×5(2)32.68°-28°41’55”
15°42’12”×5=15°×5+42’×5+12”×5=75°+210’+60”=78°31’
32.68°-28°41’55”=32°40’48”-28°41’55”
=(32-28)°+(40-41)’+(48-55)”=4°-1’-7”=3°58’53”
99*88等於多少?kuai
99*88
=(100-1)*88
=8800-88
=8712
100^-99^+88^-97^+``````+2^-1^等於多少?
利用a^2 - b^2 =(a-b)(a+b)
100^ - 99^ + 98^-97^ +……+ 2^ - 1^
=(100-99)(100+99)+(98-97)(98+97)+……+(2-1)(2+1)
= 100 + 99 + 98 + 97 +……+ 2 + 1
=(100+1)*100/2
= 5050
2011個99.9*2011個88.8等於?
(100.00-1)*88…8=88.8000.00-88.8=88.872.2
2011個0 2011個8和0 2010個82011個2
1999+4568+1234+55等於幾
1999+4568+1234+55
=(1999+1)+(4568+2)+(1234+1)+55-4
=2000+4570+1235+55-4
=2000+4570+(1235+55)-4
=2000+4570+1290-4
=2000+5860-4
=7860-4
=7856
45.99+0.78×(165+150)÷2±5.29等於多少
168.84±5.29
174.13
163.55