Đỗ Thành Đạt
Giới thiệu về bản thân
Chiều cao của miếng đất đó là:
24 : 3 = 8 (m)
Diện tích của miếng đất ban đầu có tất cả là:
20 . 8 = 160 (m22)
Vậy diện tích của miếng đất ban đầu là 160 m22.
Gọi số hàng có thể xếp được là : x(x∈N∗)x(x∈N∗)
Theo bài ra : x∈ƯC(48;18)x∈ƯC(48;18)
Mà : 48=24.318=2.3248=24.318=2.32
=>UCLN(48;18)=2.3=6=>UCLN(48;18)=2.3=6
=>x∈Ư(6)={1;2;3;6}=>x∈Ư(6)={1;2;3;6}
Mà : x≥5x≥5
=>x=6=>x=6
Vậy có thể xếp được 6 hàng thỏa mãn yêu cầu đề bài
a) (454−x)+43=116=>454−x+64=116=>518−x=116=>x=518−116=402(454−x)+43=116=>454−x+64=116=>518−x=116=>x=518−116=402
b) x∈N=>x+1∈N∗x∈N=>x+1∈N∗
Theo bài ra : x+1∈Ư(15)={1;3;5;15}x+1∈Ư(15)={1;3;5;15}
=>x∈{0;2;4;14}=>x∈{0;2;4;14}
−127+208−73+92
=(−127−73)+(208+92)=(−127−73)+(208+92)
=−200+300=−200+300
=100=100
2353−(473+2153)+(−55+373)
=2353−473−2153−55+373=2353−473−2153−55+373
=(2353−2153)+(−473+373)−55=(2353−2153)+(−473+373)−55
=200−100−55=200−100−55
=100−55=100−55
=45=45
a)\(\dfrac{-3}{8}\)>\(\dfrac{5}{-12}\)
b)\(\dfrac{3131}{5252}\)=\(\dfrac{31}{52}\)
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a,1/3+3/4-5/6
=4/12+9/12-5/6
=13/12-5/6
=13/12-10/12
=1/4
b,-2/3+6/5:2/3-2/15
=-2/3+9/5-2/15
=-10/15+27/15-2/15
=17/15-2/15
=1
c,
-3/7+5/13+-4/7
=-39/91+35/91+-4/7
=-4/91+-4/7
=-4/91+-52/7
=48/91
d,12/19-8/13-12/19+5/-13+2
=12/19+(-8/13-5/-13)+2
=12/19+(-1)+2
=-7/19+2
=31/19