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10 x 5 + 10 x 95 = 10 x ( 5 + 95 )
= 10 x 100
= 1000
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) 2 x 6 = 12 3 x 7 = 21
12 : 2 = 6 21 : 3 = 7
12 : 6 = 2 21 : 7 = 3
4 x 8 = 32 5 x 9 = 45
32 : 4 = 8 45 : 5 = 9
32 : 8 = 4 45 : 9 = 5
b) 600 : 3 = 200 800 : 4 = 200 400 : 2 = 200
600 : 2 = 300 800 : 2 = 400 500 : 5 = 100
a) 2x6=12 3x7=21
12:2=6 21:3=7
12:6=2 21:7=3
4x8=32 5x9=45
32:4=8 45:5=9
32:8=4 45:9=5
b) 600:3=200 800:4=200 400:2=200
600:2=300 800:2=400 500:5=100
A Legend Never Dies
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1) Tính:
34 x 2= 68; 46 x 6=276; 56 x 5= 280; 11 x 5= 55; 47 x 5= 235; 45 x 5= 225; 77 x 6= 462; 90 x 5= 450; 12 x 6= 72; 11x4=44; 23x4=92; 45 x 6= 270.
2) Tìm x:
34 x X = 102
=> X = 102 - 34
=> X = 68
3) Tính;
45 : 6 = 7 ( dư 3)
34 : 5 = 6 ( dư 4)
45 : 5 = 9
54 : 6 = 9
4) .....
a) các số là: 12,14,16,18,10;22,24,26,28,20;32,34,36,68,30;42,44,46,48,49,40;52,54,56,58,50;62,64,66,68,60;72,74,76,78,70;82,84,86,88,80;92,94,96,98,90.
b) có tất cả 40 số.
bài 1
34x2=68
46x6=276
56x5=280
11x5=55
47x5=235
45x5=225
77x6=462
90x5=450
99x5=495
12x6=72
11x4=44
23x4=92
45x6=270
Bài 2
34 x X = 102
X = 102 : 34
X = 3
Bài 3
45:6=7(dư 3)
34:5=6(dư 4)
45:5=9
54:6=9
Bài 4
45
k nha,bài 4 mình ko chắc lắm
![](https://rs.olm.vn/images/avt/0.png?1311)
45x6=270
1+1+2+2+3+3+4+4+5+5+6+6+7+7+8+8+9+9
=(1x2)+(2x2)+(3x2)+(4x2)+(5x2)+(6x2)+(7x2)+(8x2)+(9x2)
=2+4+6+8+10+12+14+16+18
=6+6+8+10+12+14+16+18
=12+8+10+12+14+16+18
=20+10+12+14+16+18
=30+12+14+16+18
=42+14+16+18
=56+16+18
=72+18
=90
78:5=15(dư3)
45:5=9
x:5=25
x= 25x5
x= 125
tk nhé
![](https://rs.olm.vn/images/avt/0.png?1311)
\(x.9+5=95\)
\(x.9=95-5=90\)
\(x=90:9=10\)
\(x.8=65-9=56\)
\(x=56:8=7\)
Đúng 100%
Đúng 100%
Đúng 100%
X x 9 + 5 = 95
X x 9 = 95 - 5
X x 9 = 90
X = 90 : 9
X = 10
X x 8 + 9 = 65
X x 8 = 65 - 9
X x 8 = 56
X = 56 : 8
X = 7
![](https://rs.olm.vn/images/avt/0.png?1311)
2 \(\times\) 3 \(\times\) 8 .... 45 - 5 \(\times\) 3
2 \(\times\) 3 \(\times\) 8 = 6 \(\times\) 8 = 48
\(45-5\times3\) = 45 - 15 = 30
Vì 48 > 40 nên
2 \(\times\) 3 \(\times\) 8 > 45 - 5 \(\times\) 3
b, 46 + 56 .... 56 - 5 \(\times\) 3
46 + 56 = 102
56 - 5 \(\times\) 3 = 56 - 15 = 41
Vì 102 > 41 nên
46 + 56 > 56 - 5 \(\times\) 6
![](https://rs.olm.vn/images/avt/0.png?1311)
ta có :
x+3+x+5+x+7=45*2
x+(3+5+7)=90
x+15 =90
x =90-15
x =75
5(x+2)=95-45
5(x+2)=50
x+2=50:5
x+2=10
x=10-2
x=8