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56+56+56+56=56.4=224
45+45+45+45=45.4=180
dấu chấm là dấu nhân nha
x + 300 = 400 - 300
x + 300 = 100
x = 100 - 300
x = -200
k mk mk k lại
x+300=400-300
x+300=100
x=100-300
x=-200
x+300=400-300
x+300=100
x=100-300
x=-200
x+ 200 = 700- 400 - 100
x+ 200 = 300-100
x+ 200 = 200
x = 200-200
x=0
x+200=700-4000-100
x+200=-3300-100
x+200=-3200
x=-3200-200
x=-3400
1/2 + 5/6 + 11/12 + 19/20 + 29/30 + 41/42 + 55/56 + 71/72 + 89/90
= 1-1/2+1-1/6+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/90
= 9 – (1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90)
= 9 – [1/(1x2)+1/(2x3)+1/(3x4)+1/(4x5)+1/(5x6)+1/(6x7)+1/(7x8)+1/(8x9)+1/(9x10)]
= 9 – ( 1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10)
= 9 – (1 – 1/10) = 9 – 9/10 = 81/10
P/S: Chúc bạn hok tốt !!!
1/2+5/6+11/12+19/20+29/30+41/42+55/56+71/72+89/90 =
1-1/2+1-1/6+1-1/12+1-1/20+1-1/30+1-1/42+1-1/56+1-1/72+1-1/90 =
9 – (1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90) =
9 – [1/(1x2)+1/(2x3)+1/(3x4)+1/(4x5)+1/(5x6)+1/(6x7)+1/(7x8)+1/(8x9)+1/(9x10)] =
9 – ( 1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10) =
9 – (1 – 1/10) = 9 – 9/10 = 81/10
56+x=56+4
56+x=60
x=60-56
x=4
vay x=4
\(NHA^{ }\)
56 + x = 56 + 4
<=> 56 + x = 60
x = 60 - 56
x = 4
~~~ nha bn ~~~