Toán Lớp 7: a/ Tìm x:
x ÷ $\frac{3}{4}$ = $\frac{10}{13}$ ÷ $\frac{5}{26}$
b/ Cho hàm số: y = f(x) = 2x + 2. Tính f(-1) . f$\frac{1}{2}$
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Toán Lớp 7: a/ Tìm x:
x ÷ $\frac{3}{4}$ = $\frac{10}{13}$ ÷ $\frac{5}{26}$
b/ Cho hàm số: y = f(x) = 2x + 2. Tính f(-1) . f$\frac{1}{2}$
Comments ( 2 )
a)x:3/4=10/13:5/26
x:3/4=4
x=4.3/4
x=3
Vậyx=3
b)Xét hàm số y=f(x)=2x+2
=>f(-1)=2.(-1)+2=0
f(1/2)=2.(1/2)+2=3
=>f(-1).f(1/2)=0.3=0
a, x : 3/4 = 10/13 : 5/26
x : 3/4 = 10/13 * 26/5
x : 3/4 = 2 * 2
x : 3/4 = 4
x = 4 * 3/4
x = 3
Vậy x = 3
b, Ta có:
y = f(x) = 2x + 2
f(-1) = 2 * (-1) + 2 = -2 + 2 = 0
f(1/2) = 2 * 1/2 + 2 = 1 + 2 = 3