133 ( 30 + 20 ) - 33 ( 133 + 20 )
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\(135.\left(33+20\right)-33.\left(133+20\right)\)
\(=135.53-33.153\)
\(=7155-5049\)
\(=2106\)
Học Tốt !
a
x | 8 | 30 | 100 |
125 + x | 125 + 8 = 133 | 125 + 30 = 155 | 125 + 100 = 225 |
b
y | 200 | 960 | 1350 |
y - 20 | 200 - 20 = 180 | 960 - 20 = 940 | 1350 - 20 = 1330 |
3/2+7/6+13/12+21/20+...+133/132
=1+ 1/2 + 1+ 1/6 + 1+ 1/12 + 1+ 1/20+......+ 1+ 1/132
=(1+ 1 + 1+.....+ 1) + ( 1/2+ 1/6+1/12+ 1/20+....+ 1/132)
= 11+ ( 1/1×2+ 1/2×3+1/3×4+1/4×5+.....+1/11×12)
=11+ ( 1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+......+1/11-1/12)
=11+(1-1/12)
= 11+11/12
=143/12
3/2+7/6+13/12+21/20+...+133/132 =1+ 1/2 + 1+ 1/6 + 1+ 1/12 + 1+ 1/20+......+ 1+ 1/132 =(1+ 1 + 1+.....+ 1) + ( 1/2+ 1/6+1/12+ 1/20+....+ 1/132) = 11+ ( 1/1×2+ 1/2×3+1/3×4+1/4×5+.....+1/11×12) =11+ ( 1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+......+1/11-1/12) =11+(1-1/12) = 11+11/12 =143/12
1.
15X-133=17
15X=17+133
15X=150
X=150:15
X=10
2.
14X+54=82
14X=82+54
14X=28
X=28:14
X=2
3.
17X-20=14
17X=14+20
17X=34
X=34:17
X=2
li.ke mk nhé
a,[(-17)-13]+(-20)
=-30-20
=-50
b,777-(-133)-60-50
=910-110
=800
c,-(-319)+(-127)-312+20
=192-292
=-100
(- 6955) - 33 - 45 - (- 133)
= - 6955 - 33 - 45 + 133
= (- 6955 - 45) + (133 - 33)
= - (6955 + 45) + 100
= - 7000 + 100
= - 6900
=133.50-33.153
=6650-5049
=1601
133 ( 30 + 20 ) - 33 ( 133 + 20 )
= 133 * 30 + 133 * 20 - ( 33 * 133 + 33 * 20 )
= 133 * 30 + 133 * 20 - 33 * 133 - 33 * 20
= 133 * 30 - 33 * 133 + 133 * 20 - 33 * 20
= 133 ( 33 - 30 ) + 20 * ( 133 - 33 )
= 133 * 3 + 20 * 100
= 399 + 2000
= 2399