Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
64x52+37x52-2,26
= 52x(64+37)-2,26
= 52x 101-2,26
= 5252-2,26
=5249,74
Bài làm:
Ta có: \(3\cdot\left(\frac{x}{4}+\frac{x}{28}+\frac{x}{70}+\frac{x}{130}\right)=\frac{60}{15}\)
\(\Leftrightarrow3x\cdot\left(\frac{1}{1.4}+\frac{1}{4.7}+\frac{1}{7.10}+\frac{1}{10.13}\right)=4\)
\(\Leftrightarrow x\cdot\left(\frac{3}{1.4}+\frac{3}{4.7}+\frac{3}{7.10}+\frac{3}{10.13}\right)=4\)
\(\Leftrightarrow x\cdot\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}\right)=4\)
\(\Leftrightarrow x\cdot\left(1-\frac{1}{13}\right)=4\)
\(\Leftrightarrow x\cdot\frac{12}{13}=4\)
\(\Rightarrow x=\frac{13}{3}\)
Ta có : \(3\times\left(\frac{x}{4}+\frac{x}{28}+\frac{x}{70}+\frac{x}{130}\right)=\frac{60}{15}\)
=> \(3\times x\times\left(\frac{1}{4}+\frac{1}{28}+\frac{1}{70}+\frac{1}{130}\right)=4\)
=> \(x\times\left(\frac{3}{4}+\frac{3}{28}+\frac{3}{70}+\frac{3}{130}\right)=4\)
=> \(x\times\left(\frac{3}{1\times4}+\frac{3}{4\times7}+\frac{3}{7\times10}+\frac{3}{10\times13}\right)=4\)
=> \(x\times\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+\frac{1}{7}-\frac{1}{10}+\frac{1}{10}-\frac{1}{13}\right)=4\)
=> \(x\times\left(1-\frac{1}{13}\right)=4\)
=> \(x\times\frac{12}{13}=4\)
=> \(x=4:\frac{12}{13}\)
=> \(x=\frac{13}{3}\)
130:x=23-19
130:x=4
x=130:4
x=32,5
tích đúng giup mk nha thanks
a) 13,104 : x = 6,88
x= 13,104 : 6,88
x= 819/430
b) ( 312 - x ) : 12,6 = 24,5
312 - x = 24,5 * 12,6
312 - x = 308,7
x = 312 - 308,7
x = 3,3
OK
a) x = 13,104 : 6,88
<=> x = 819 / 430
b) 312 - x = 24,5 x 12,6
312- x = 308,7
x = 308,7 - 312
x = - 3,3
y x 5 + y x 4 + y x 3 + y x 88 = 419,824
y x ( 5 + 4 + 3 + 88 ) = 419,824
y x 100 = 419,824
y = 419,824 : 100
y = 4,19824
Vậy y = 4,19824
198 - 42 : 6 . x + 16 = 130
=> 214 - 7.x = 130
=> 7.x = 214 - 130
=> 7.x = 84
=> x = 84 : 7
=> x = 12
(. là nhân)
5 x 7 x 77 -7 x 60 + 49 x25 - 15 x 42
=7x385-7x60+49x25-15x42
=7x(385-60)+49x25-15x42
=7x325+49x25-15x42
=2275+49x25-15x42
=2275+1225-630
=3500-630
=2870
130 - 3x = 88
3x = 130 - 88
3x = 42
x = 42 : 3
x = 14