各位知識朋友 , 入黎幫我手 ar !!! ( P6升F1-數學暑期作業 ) (13)

1.(a) (-8)x(-2)x(+3)
= (+16)x(+3)
= 48

1.(b) (+3)/(-7)/(+1/7)
= (-3/7) / (+1/7)
= (-3/7) x (+7/1)
= -3

2. (a) y - 10 = (-8)
y = (-8) + 10
y = 2

2. (b) 2y + 5 = (-11)
2y = (-11) -5
2y = -16
y = (-16)/2
y = -8

2. (c) 3y / 2 = (-9/8)
3y = (-9/8) x 2
3y = (-9/4)
y = (-9/4)/3
y = (-9/4) x (1/3)
y = -3/4

2. (d) 12 + 3y= (-4) - 5y
3y = (-4) - 5y -12
3y = -16 -5y
3y + 5y = -16
8y = - 16
y = (-16)/8
y = -2

3. (a) (-4)-(-5)
= (-4)+5
= 1

3. (b) (-1/2) x (-1/3) / (-1/6)
= (1/6) / (-1/6)
= (1/6) x (-6/1)
= -1

1a. (-8)×(-2)×(+3)= 16 X 3 ((負負得正))
=48
b. (+3)÷(-7)÷(+1∕7)
=3÷(-1) ((正負得負))
= -3

2a. y-10=「-8」
y=10-8 ((將10搬去右邊 所以負變正))
=2
b. 2y+5=「-11」
2y= -5-11 (一樣都係搬 所以正數變負數))
2y= -16
y= -8
c. 3y∕2=「-9∕8」
3y= -9/4 ((兩邊乘2))
y= -3/4
d. 12+3y=「-4」減5y
8y= -16 ((將佢變成一邊有未知數,一邊係實數))
y= -2
3a. (-4)減(-5)
= -4 +5 (拆個括號負負得正變 正5))
=1
b. (-1∕2)×(-1∕3)÷(-1∕6)
=(-1/2)X 2 ((做左後面先因為有得約))
= -1 ((將2約埋))

講多句丫 你連 (-4) - (-5) 都唔識呢你要努力D
只要記得3樣野::
(負負得正,正負得負,正正得正)
咁你好多呢d數就得架喇=]