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cắt quả cam thành 20p
cười bạn
\(64\cdot4^x=4^5\)
\(64=4^5:4^x\)
\(64=4^{5-x}\)
\(4^{5-x}=4^3\)
\(\Rightarrow5-x=3\)
\(x=5-3\)
\(x=2\)
\(\text{Tổng 2 số gấp 5 lần số bé tức nếu tổng 5 phần thì số bé là 1 phần.}\)
\(\text{Số lớn chiếm số phần là:}\)
\(\text{5-1=4(phần)}\)
\(\text{Hiệu số phần bằng nhau là:}\)
\(\text{4-1=3(phần)}\)
\(\text{Số lớn là:}\)
\(\text{(705:3)x4=940}\)
\(\text{Số bé là: }\)
\(\text{940-705=235}\)
\(\text{ Đ/S:......}\)
\(\dfrac{x-2}{3}=\dfrac{x+1}{4}\)
⇒\(4\left(x-2\right)=3\left(x+1\right)\)
\(4x-8=3x+3\)
\(4x-3x=8+3\)
\(x=11\)
Số sách ban đầu ở ngăn A là:
\(\dfrac{3}{3+5}=\dfrac{3}{8}\) (cả giá sách)
Số sách sau khi chuyển ở ngăn A là:
\(\dfrac{1}{1+2}=\dfrac{1}{3}\) (cả giá sách)
10 quyển sách tương ứng với:
\(\dfrac{3}{8}-\dfrac{1}{3}=\dfrac{1}{24}\) (cả giá sách)
Số sách ban đầu của ngăn A là:
\(10:\dfrac{1}{24}x\dfrac{3}{8}=90\) (quyển sách)
ĐS:..........
Tuổi cháu là:
60:(4-1)x1=20(tuổi)
Tuổi cháu là:
60+20=80(tuổi)
ĐS:.....