- 120+156-80000
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A = 1 2.3 + 2 3.4 + 1 4.5 + 1 5.6 + 1 6.7 + 1 7.8
1 2 − 1 3 + 1 3 − 1 4 + 1 4 − 1 5 + 1 5 − 1 6 + 1 6 − 1 7 + 1 7 − 1 8 = 3 8
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120=23.3.5
156=22.3.13
180=22.32.5
=>UCLN(120;156;180)=22.3=12
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B = 1 2 + 1 6 + 1 12 + 1 20 + 1 30 + 1 42 + 1 56 + 1 72 + 1 90
B = 1 1.2 + 1 2.3 + 1 3.4 + 1 4.5 + 1 5.6 + 1 6.7 + 1 7.8 + 1 8.9 + 1 9.10
= 1 − 1 2 + 1 2 − 1 3 + 1 3 − 1 4 + 1 4 − 1 5 + ... + 1 9 − 1 10
= 1 + − 1 2 + 1 2 + − 1 3 + 1 3 + − 1 4 + 1 4 + − 1 5 + 1 5 + ... + − 1 9 + 1 9 − 1 10
= 1 − 1 10 = 9 10
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để tính số tiền lỗ phải tính :80 000x6:100
**** mình nhé!
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a)(x-35)-120=0
x-35 =0+120
x-35 =120
x =120+35
x =155
b)124+(118-x)=217
118-x =217-124
118-x =93
x=118-93
x=25
c)156-(x+61)=82
x+61=156-82
x+61 =74
x =74-61
x =13
\(\left(x-35\right)-120=0\)
\(=>x-35=120\)
\(=>x=120+35\)
\(=>x=155\)
120 + 156 - 80000
= -79724
Toán 6 nhé !!!
120+156-80000
=276-80000
=-79724