標題:
MATHs 99我(F.2)
發問:
不等式 (4X-9)/11>(12X-11)/7-6 .............. .............. ............... .............. .............. 答案X<5 99999999999999999999999999999999999999999999999999999我呀!! 明天要交la!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
最佳解答:
(4X-9)/11>(12X-11)/7-6 7(4X-9)>11(12X-11)-462...............<全式乘上77> 28X-63>132X-121-462 520>104X..................................<移項> X<5
(4x-9)/11>(12x-11)/7-6 (*77) 28x-63>132x-121-462 28x-63>132x-583 132x-583<28x-63 104x<520 x<5|||||(4X-9)/11>(12X-11)/7-6 7(4X-9)>11(12X-11)-462...............<全式乘上77> 28X-63>132X-121-462 520>104X..................................<移項> X<5|||||(4X-9)/11>(12X-11)/7-6 (4X-9)7-(4X-9)6>11(12X-11) 28X-63-24X+54>132X-121 28X-24X-132X>-121+63-54 -128X>-112 X>112/128 X>7/8|||||(4x-9)/11 > (12x-11)/7-6 (4x-9)/11 > (12x-11)/7- 42/7 <------ 42/7 即係 6 (方便 d計 ) (4x-9)/11 > (12x-11-42)/7 (4x-9)/11 > (12x-53)/7 7(4x-9) > 11(12x-53) <----- 除變乘之後就等如呢步 28x-63 > 132x-583 -104x > - 520 x< 5 <----- 除負數要轉符號
MATHs 99我(F.2)
發問:
不等式 (4X-9)/11>(12X-11)/7-6 .............. .............. ............... .............. .............. 答案X<5 99999999999999999999999999999999999999999999999999999我呀!! 明天要交la!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
最佳解答:
(4X-9)/11>(12X-11)/7-6 7(4X-9)>11(12X-11)-462...............<全式乘上77> 28X-63>132X-121-462 520>104X..................................<移項> X<5
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其他解答:(4x-9)/11>(12x-11)/7-6 (*77) 28x-63>132x-121-462 28x-63>132x-583 132x-583<28x-63 104x<520 x<5|||||(4X-9)/11>(12X-11)/7-6 7(4X-9)>11(12X-11)-462...............<全式乘上77> 28X-63>132X-121-462 520>104X..................................<移項> X<5|||||(4X-9)/11>(12X-11)/7-6 (4X-9)7-(4X-9)6>11(12X-11) 28X-63-24X+54>132X-121 28X-24X-132X>-121+63-54 -128X>-112 X>112/128 X>7/8|||||(4x-9)/11 > (12x-11)/7-6 (4x-9)/11 > (12x-11)/7- 42/7 <------ 42/7 即係 6 (方便 d計 ) (4x-9)/11 > (12x-11-42)/7 (4x-9)/11 > (12x-53)/7 7(4x-9) > 11(12x-53) <----- 除變乘之後就等如呢步 28x-63 > 132x-583 -104x > - 520 x< 5 <----- 除負數要轉符號
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