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a,
23 x (7 - 4) = 23 x 3 = 69
23 x 7 - 23 x 4 = 161 - 92 = 69
Ta có: 23 x (7 - 4) = 23 x 7 - 23 x 4
b,
(8 - 3) x 9 = 5 x 9 = 45
8 x 9 - 3 x 9 = 72 - 27 = 45
Ta có: (8 - 3) x 9 = 8 x 9 - 3 x 9
bài 1 :
x + 678 = 2813
x = 2813 - 678
x = 2135
4529 + x = 7685
x = 7685 - 4529
x = 3156
x - 358 = 4768
x = 4768 + 358
x = 5126
2495 - x = 698
x = 2495 - 698
x = 1797
x × 23 = 3082
x = 3082 : 23
x = 134
36 × x = 27612
x = 27612 : 36
x = 767
x : 42 = 938
x = 938 x 42
x = 39396
4080 : x = 24
x = 4080 : 24
x =170
bài 2 :
a. x + 6734 = 3478 + 5782
x + 6734 = 9260
x = 9260 - 6734
x = 2526
b. 2054 + x = 4725 - 279
2054 + x = 4446
x = 4446 - 2054
x = 2392
c. x - 3254 = 237 x 145
x - 3254 = 34365
x = 34365 + 3254
x = 37619
d. 124 - x = 44658 : 54
124 - x = 827
x = 827 - 124
x = 703
a: =>x+7/4=6:2/3=9
=>x=29/4
b: =>x:5/3=7/5
=>x=7/5*5/3=7/3
c:=>x+1/6=5/3
=>x=10/6-1/6=3/2
d: =>x+4/5=4/5+3/7+3/5
=>x=3/7+3/5=36/35
e: =>x/35=4/5-5/7=3/35
=>x=3
f: =>13/28+x=1/2
=>x=1/28
g: =>1/3-x=1/9
=>x=2/9
\(a,564\times8-64\times4\times2=564\times8-64\times8=8\times\left(564-64\right)=8\times500=4000\\ b,37\times18-9\times74+100\\ =37\times2\times9-9\times74+100\\ =\left(74\times9-9\times74\right)+100=0+100=100\\ c,679\times78+679\times23-679=679\times\left(78+23-1\right)\\ =679\times100\\ =67900\)
\(a,x=\dfrac{1}{2}-\dfrac{2}{5}\)
\(x=\dfrac{1}{10}\)
\(b,x+\dfrac{3}{7}=\dfrac{7}{10}\)
\(x=\dfrac{7}{10}-\dfrac{3}{7}\)
\(x=\dfrac{19}{70}\)
\(c,19-x=\dfrac{17}{20}\)
\(x=19-\dfrac{17}{20}\)
\(x=\dfrac{363}{20}\)
a: x=9/2-3/7=57/14
b: =>x=7/5x5/7=1
c: =>x=11/3:3/8=11/3x8/3=88/9
a : x = \(\dfrac{9}{2}\) - \(\dfrac{3}{7}\) = \(\dfrac{57}{14}\)
b : = > x = \(\dfrac{7}{5}\) x\(\dfrac{5}{7}\) = 1
c : = > \(\dfrac{11}{3}\) : \(\dfrac{3}{8}\) = \(\dfrac{11}{3}\) x \(\dfrac{8}{3}\) = \(\dfrac{88}{9}\)
a) \(23:x+37:x=4\)
\(\left(23+37\right):x=4\)
\(60:x=4\)
\(x=60:4\)
\(x=15\)
vậy \(x=15\)
b) \(x:8:2=3\)
\(x:4=3\)
\(x=12\)
vậy \(x=12\)
học vui Nguyen Thi Huong