-76.54 + 12 . (-76) - 76 . (-36)
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a: =-64(32+68)=64x100=-6400
b: =76(-54-12+36)=76x(-30)=-2380
c: =19x50+38x5=950+190=1140
( 12 - x ) + 36 = 76
=12- x = 76 - 36
= 12 - x = 40
x = 40 - 12
x = 28
mình nghĩ thế ^_^
Sửa đề: =11
=>\(\dfrac{x-15}{17}-5+\dfrac{x-36}{16}-4+\dfrac{x-76}{12}-2=11-5-4-2=0\)
=>x-100=0
=>x=100
Sửa đề: (x-15)/17
=>\(\left(\dfrac{x-15}{17}-5\right)+\left(\dfrac{x-36}{16}-4\right)+\left(\dfrac{x-58}{14}-3\right)+\left(\dfrac{x-76}{12}-2\right)=0\)=>x-100=0
=>x=100
\(\dfrac{x-90}{10}+\dfrac{x-76}{12}+\dfrac{x-58}{14}+\dfrac{x-36}{16}+\dfrac{x-15}{17}=15\)
\(\Leftrightarrow\dfrac{x-90}{10}-1+\dfrac{x-76}{12}-2+\dfrac{x-58}{14}-3+\dfrac{x-36}{16}-4+\dfrac{x-15}{17}-5=0\)
\(\Leftrightarrow\dfrac{x-100}{10}+\dfrac{x-100}{12}+\dfrac{x-100}{14}+\dfrac{x-100}{16}+\dfrac{x-100}{17}=0\)
\(\Leftrightarrow\left(x-100\right)\left(\dfrac{1}{10}+\dfrac{1}{12}+\dfrac{1}{14}+\dfrac{1}{16}+\dfrac{1}{17}\right)=0\)
\(\Leftrightarrow x-100=0\) (do \(\dfrac{1}{10}+\dfrac{1}{12}+\dfrac{1}{14}+\dfrac{1}{16}+\dfrac{1}{17}\ne0\))
\(\Leftrightarrow x=100\)
\(-54.76+12.\left(-76\right)-76.\left(-34\right)\)
\(=54.\left(-76\right)+12.\left(-76\right)-\left(-76\right).34\)
\(=-76.\left(54+12-34\right)\)
\(=-76.32\)
\(=-2432\)
-54*76+12*(-76)-76*(-34)
=(-4104)+(-912)-(-2584)
=-2429
k cho mk nhé
10 + (32 + 98) + (54 + 76) = 10 + 130 + 130 = 270
(12 + 78) + (36 + 54)+ 90 = 90 + 90 + 90 = 3 x 90 = 270
\(\left(-76\right).54+12.\left(-76\right)-76.\left(-36\right)\)
\(=\left(-76\right).54+12.\left(-76\right)+\left(-76\right).\left(-36\right)\)
\(=\left(-76\right).\left(54+12-36\right)\)
\(=\left(-76\right).30\)
\(=-2280\)