【碎化片时间管理】 [20240107]
[小学数学]
求x等于多少?
x/42 + x/56 + x/72 = 3
解:此题思路用分数裂项公式
(1/42 + 1/56 + 1/72)x = 3
(1/6*7 + 1/7*8 +1/8*9)x =3
(1/6 - 1/7+ 1/7 -1/8 -1/8-1/9)
x =3
(1/6 - 1/9)x = 3
1/18 x = 3
x= 54
【碎化片时间管理】 [20240107]
[小学数学]
求x等于多少?
x/42 + x/56 + x/72 = 3
解:此题思路用分数裂项公式
(1/42 + 1/56 + 1/72)x = 3
(1/6*7 + 1/7*8 +1/8*9)x =3
(1/6 - 1/7+ 1/7 -1/8 -1/8-1/9)
x =3
(1/6 - 1/9)x = 3
1/18 x = 3
x= 54