Câu 25-30 ạ
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25 + ( x - 15 ) = 30
x - 15 = 30 - 25
x = 5 + 15
x = 20
91 . 25 - 91 . 13 - 91 . 12
= 91. ( 25 - 13 -12 )
= 91. 0
= 0
64 . 16 + 81 . 84 + 17 . 16
= 16. ( 64 + 17 ) + 81 . 84
= 16 . 81 + 81 . 84
= 81 . ( 84 + 16 )
= 81 . 100
= 8100
~HT~ and ~ T.i.c.k ~
\(\dfrac{x-55}{45}+\dfrac{x-30}{35}+\dfrac{x-25}{25}+\dfrac{x-40}{15}=10\)
\(< =>\dfrac{x-55}{45}+\dfrac{x-30}{35}+\dfrac{x-25}{25}+\dfrac{x-40}{15}-10=0\)
\(< =>\dfrac{x-55}{45}-1+\dfrac{x-30}{35}-2+\dfrac{x-25}{25}-3+\dfrac{x-40}{15}-4=0\)
\(< =>\dfrac{x-100}{45}+\dfrac{x-100}{35}+\dfrac{x-100}{25}+\dfrac{x-100}{15}=0\)
\(< =>\left(x-100\right)\left(\dfrac{1}{45}+\dfrac{1}{35}+\dfrac{1}{25}+\dfrac{1}{15}\right)=0\)
\(< =>x-100=0\left(\dfrac{1}{45}+\dfrac{1}{35}+\dfrac{1}{25}+\dfrac{1}{15}\ne0\right)\)
\(< =>x=100\)
\(1) 420+65.4=(x+175):5+30\)
\(\implies 420+260=(x+175):5+30\)
\(\implies 680=(x+175):5+30\)
\(\implies 650=(x+175):5\)
\(\implies 650.5-175=x\)
\(\implies 3075=x\)
\(2)x-4867=(175.2050.70):25+23\)
\(\implies x-4867=1004500+23\)
\(\implies x-4867=1004523\)
\(\implies x=1009390\)
\(3) 134-[(96-7x):4-2]=126\)
\(\implies (96-7x):4-2=8\)
\(\implies(96-7x):4=10\)
\(\implies 96-7x=40\)
\(\implies 7x=56\)
\(\implies x=8\)
\(4) 4-\{100-[(100-5x):8-5]:10\}:25=0\)
\(\implies 4-\{100-[(100-5x):8-5]:10\}=0\)
\(\implies 100-[(100-5x):8-5]:10=4\)
\(\implies 100-[(100-5x):8-5]=40\)
\(\implies (100-5x):8-5=60\)
\(\implies (100-5x):8=65\)
\(\implies 100-5x=520\)
\(\implies 5x=-420\)
\(\implies x=-84\)
~ Hok tốt a~
Câu 1: (5-25)-(-17)+40
=-20-(-17)+40
=-37+40
=3
Câu 2: (-7)-[(-30)+27]+(-11)
=(-7)-(-3)+(-11)
=-10+(-11)
=-21
Câu 3: (-77)+13+77+100+(-13)
=-64+77+100+(-13)
=13+100+(-13)
=113+(-13)
=100
Câu 4: 9-18+[15-(-28)]
=9-18+-13
=-9+-13
=-22
25 does the sun set
26 She will get
27 Will David be
28 will the weather be like
29 Will you get
30 does he get there