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a: =>x=1135:37=1135/37
b: =>3x=165
hay x=55
c: =>x-8=92
hay x=100
\(a,x=1135:37=30\left(dư.27\right)\\ b,x\times3=40755:247=165\\ x=165:3=55\\ c,x-8=57316:623=92\\ x=92+8=100\)
Bài 13 : Tìm x
30240 : x = 42
x = 30240 : 42
x = 720
X x 12 = 2412
X = 2412 : 12
X = 201
57316 : ( X - 8 ) = 623
X - 8 = 57316 : 623
X - 8 = 92
X = 92 + 8
X = 100
( X + 3 ) x 247 = 10755
X + 3 = 10755 : 247
X + 3 = 10755/247
X = 10755/247 - 3
X = 10014/247
X x 37 = 1135
X = 1135 : 37
X = 1135/37
25 x X = 9100
X = 9100 : 25
X = 364
Bài 13
1.720 2.201 3.100 4.162 5. 1135/37 6.364
bài 14
( 367*584+12345 ) * ( 3570: 357 - 10)
= ( 367*584+ 12345 ) * ( 10-10 )
= ( 367*584+12345 ) * 0
= 0
(367*584+12345)*(3570:357-10)
=(367*584+12345)*(10-10)
=(367*584+12345)*0
=0
\(\frac{637\times527-189}{526\times637+448}\)
\(=\frac{637\times\left(526+1\right)-189}{526\times637+448}\)
\(=\frac{637\times526+637-189}{526\times637+448}\)
\(=\frac{637\times526+448}{526\times637+448}\)
\(=1\)
\(\frac{677\times874+251}{678\times874-623}\)
\(=\frac{677\times874+251}{\left(677+1\right)\times874-623}\)
\(=\frac{677\times874+251}{677\times874+874-623}\)
\(=\frac{677\times874+251}{677\times874+251}\)
\(=1\)
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c) 637 x 527 - 189=335510 / 526 x 637 + 448=335510
d) 677 x 874 + 251 =591949 / 678 x 874 - 623=591949
học tốt
c, 637x527-189/526x637+448=335918,116
d, 677x874+251/678x874-623=91398,5605
( X - 8 ) = 57316 : 623
X - 8 = 92
X = 92 + 8
X = 100
100 nha dung day minh giai duoc 300/300