Tính nhanh
a, M= 5.(-1,3) - (2,17 +1,5.2) . (-0,01)
b, N=(-7).0,87+(-7).9,13+(-1,56):(-1,2)+2^3
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\(-4,43.1,2+0,87.\frac{-6}{5}+\frac{-3}{3}:\frac{5}{6}=\)\(-4,43.\frac{6}{5}+\left(-0,87\right).\frac{6}{5}+\frac{-3}{3}.\frac{6}{5}\)
\(=\frac{6}{5}.\left[\left(-4,43\right)+\left(-0,87\right)+\left(-3,3\right)\right]\)\(=\frac{6}{5}.\left(-8,6\right)=\frac{-258}{25}=-10,32\)
a,\(\frac{7}{10}\cdot\frac{4}{9}+\frac{3}{10}\cdot\frac{4}{9}-1\frac{7}{9}\)
\(=\frac{14}{45}+\frac{2}{15}-\frac{16}{9}\)
\(=\frac{14}{45}+\frac{6}{45}-\frac{80}{45}\)
\(=\frac{-60}{45}=\frac{-4}{3}\)
b,\(\frac{-5}{6}+\frac{4}{9}\cdot\left(\frac{5}{4}-\frac{2}{3}\right)\cdot\left(-3\right)^2+\frac{5}{9}\cdot30\%\)
\(=\frac{-5}{6}+\frac{4}{9}\cdot\left(\frac{7}{12}\right)\cdot9+\frac{5}{9}\cdot\frac{3}{10}\)
\(=\frac{-5}{6}+\frac{7}{3}+\frac{1}{6}\)
\(=\frac{-5}{6}+\frac{14}{6}+\frac{1}{6}\)
=\(=\frac{10}{6}=\frac{5}{3}\)
a,3x-0,75=-1,2
3x=-1,2+-0,75
3x=-9/20
x=-9/20:3
x=-3/20
kl:....
b,2/3/5:(2x-1/2)=1,3
2/3/5??????
c,3/4x-5/6=7/12x-5/4
3/4x-7/12x=-5/4+5/6
9/12x-7/12x=-15/12+10/12
2/12x=-5/12
2:12x=-5/12
12x=2:-5/12
12x=-24/5
x=-24/5:12
x=-2/5
kl:....
chúc bn học tốt
2.34 x 1.3 + 23.4 x 0.87
= 2.34 x 1.3 + 2.34 x 8.7
= 2.34x( 1.3+8.7 )
= 2.34 x 10
= 23.4
`5/3+(−2/7)−(−1,2)`
`=5/3-2/7+1,2`
`=5/3-2/7+6/5`
`=175/105-30/105+126/105`
`=271/105`
a, ( 4,578 x 3 +5,422 x 3 ) : 1,2 -1,2
= [ 3 x ( 4,578 +5,422 ) ] : 1,2 -1,2
= ( 3 x 10 ) : 1,2 -1,2
= 30 : 1,2 -1,2
= 25 -1,2
= 23,8
b, \(\frac{3}{5}\)x\(\frac{9}{7}\)-\(\frac{3}{5}\)x\(\frac{3}{14}\)
= \(\frac{3}{5}\)x ( \(\frac{9}{7}\)- \(\frac{3}{14}\))
= \(\frac{3}{5}\)x\(\frac{15}{14}\)
= \(\frac{9}{14}\)
Chúc bạn học tốt
(4,578 x 3 + 5,422 x 3 ) : 1,2 - 1,2
=( 3 x [4,578 + 5,422 ] : 1,2 - 1,2
=(3 x 10) : 1,2 - 1,2
=30 : 1,2 - 1,2
=25-1.2
=23.8
Lời giải:
a.
$M=-6,5-(2,17+3)(-0,01)$
$=-6,5-5,17(-0,01)=-6,5+0,0517=-6,449$
b.
$N=(-7)(0,87+9,13)+1,3+8$
$=-7.1+1,3+8=-7+8+1,3=1+1,3=2,3$