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9題英文數(小6升中1)幫幫手 急急急急急急急急

發問:

其實我主要想知點計,所以最好有列式.1.Express the following numbers as the product of prime factors.(a)144= (b)2100=2.Find the H.C.F. and the L.C.M. of the following and answer in index notation.(a)2(2次方)×3 × 7(2次方) and 2(2次方) ×3(2次方) ×7 ... 顯示更多 其實我主要想知點計,所以最好有列式. 1.Express the following numbers as the product of prime factors. (a)144= (b)2100= 2.Find the H.C.F. and the L.C.M. of the following and answer in index notation. (a)2(2次方)×3 × 7(2次方) and 2(2次方) ×3(2次方) ×7 (b)2×5(3次方) ×7(2次方) and 5×7(2次方)×11(2次方) 3.Calculate(-2/3)(+9)÷(-6) 4.Calculate: (+3)(-11)(-20) -------------------- (+5)(-33) 5.If x=+2,y=-5 and z=+7,calculate: xy-yz 6.If: 3m-n -------- =p,n=? 2 7.If: x/3=y/5,x=? 8.Match: (a)2a + b=c (i) b=4c- a (b)a + b=4c (ii) a=-b + 2c (c)a + b=2c (iii) b=c - 2a (d)a - 2b= c /2 (iv) c=2a - 4b 9.Mark r the subject of the formula p=2r + q 唔該幫幫手 更新: 我唔係唔想做,係唔識做.

最佳解答:

1. (a) 144 = 2 x 2 x 2 x 2 x 3 x 3 = 2^4 x 3^2 (b) 2100 = 2 x 2 x 3 x 5 x 5 x 7 = 2^2 x 3 x 5^2 x 7 2. (a) 2^2 x 3 x 7^2 and 2^2 x 3^2 x 7 H.C.F = 2^2 x 3 x 7 L.C.M. = 2^2 x 3^2 x 7^2 (b) 2 x 5^3 x 7^2 and 5 x 7^2 x 11^2 H.C.F. = 5 x 7^2 L.C.M. = 2 x 5^3 x 7^2 x 11^2 3. (-2/3)(+9)(-6) = ( 2 / 3 ) ( 9 ) / 6 = (2 x 3 ) / 6 = 6 / 6 = 1 4. (+3)(-11)(-20) ------------------- (+5)(-33) = –( 3 x 11 x 20 ) / ( 5 x 33 ) = –( 11 x 20 ) / ( 5 x 11 ) = –20 / 5 = –4 5. xy – yz = 2 x ( –5 ) – ( –5 ) x 7 = –10 + 35 = 25 6. ( 3m – n ) / 2 = p 3m – n = 2p 3m = 2p + n n + 2p = 3m n = 3m – 2p 7. x / 3 = y / 5 [ The common denominator is 15 (公分母是 15 ), 兩邊乘 15 ] 5x = 3y x = 3y / 5 8.Match: (a) 2a + b = c (i) b = 4c – a (b) a + b = 4c (ii) a = –b + 2c (c) a + b = 2c (iii) b = c – 2a (d) a – 2b = c/2 (iv) c = 2a – 4b (a) = > (iii) (b) = > (i) (c) = > (ii) (d) = > (iv) [ 兩邊乘 2 ] 9. p = 2r + q 2r + q = p 2r = p – q r = ( p – q ) / 2

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