用1、3、3、8凑成24点
用1、3、3、8凑成24点
1, 3, 3, 8的24点答案:
1: (1 + 8) × 3 - 3
2: ((1 + 8) × 3) - 3
3: 3 - (1 - 8) × 3
4: 3 - ((1 - 8) × 3)
5: (3 × (1 + 8)) - 3
6: 3 × (1 + 8) - 3
7: 3 - (3 × (1 - 8))
8: 3 - 3 ×(1 - 8)
9: 3 + (3 × (8 - 1))
10: 3 + 3 ×(8 - 1)
11: 3 + (8 - 1) × 3
12: 3 + ((8 - 1) × 3)
13: (3 × (8 + 1)) - 3
14: 3 × (8 + 1) - 3
15: (3 × (8 - 1)) + 3
16: 3 × (8 - 1) + 3
17: (8 + 1) × 3 - 3
18: ((8 + 1) × 3) - 3
19: (8 - 1) × 3 + 3
20: ((8 - 1) × 3) + 3
1, 3, 4, 6的24点答案:
1: 6 ÷ (1 - 3 ÷ 4)
2: 6 ÷ (1 - (3 ÷ 4))
3x*(1+7分之3)=70
3x*(10/3)=70
10x=70
x=7
2y-1/3=-(y/3)+2
2y-1/3=-(y/3)+2
2y+y/3=1/3+2
7y/3=7/3
y=1
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(5a-3b)-3(a^2-2b)
=5a-3b-3a^2+6b
=5a-3a^2+3b
(y+3)-(x+3)=24怎么解
把这看成是一个方程,放在坐标系里是一条直线,所有直线上的点的坐标都满足这个方程~
如果楼主没学过这些的话,那就随便带进去一个x,就会解出一个y,带进去一个y也会解出一个x
2*3^(x)=3*7^(x)怎么解呀
2*3^(x)=3*7^(x)
3^(x)/7^(x)=3/2
(3/7)^x=3/2
xlg(3/7)=lg(3/2)
x=lg(3/2)/lg(3/7)
(x+3)²-(x-3)×(x-5)=16
答:
(x+3)²-(x-3)(x-5)=16
(x+3)²-16=(x-3)(x-5)
(x+3-4)(x+3+4)=(x-3)(x-5)
(x-1)(x+7)=(x-3)(x-5)
x²+6x-7=x²-8x+15
14x=22
x=11/7
0.300等于3毛还是3元
这个意思是这样
0.3元等于3毛
就是这样的
1kg/m^3= g/dm^3
1kg=1000g
1m^3=1000dm^3
1kg/m^3= 1000g/1000dm^3=1g/dm^3
∫f(x^3)dx=x^3+C,求f(x)
∫f(x³)dx=x³+C,两边微分
d/dx ∫f(x³)=d/dx x³+d/dx C
f(x³)=3x²
令x³=t,x=t^1/3
∴f(t)=3(t^1/3)²
=3t^(2/3)
∴f(x)=3x^(2/3)