a. ( - 57 ) . ( 67 - 34 ) - 67 . (34 -57 )

=  - 57 . 67 - ( - 57 ) . 34 - 67 . 34 - 67 . 57

= 57 . ( 67 - 67 ) + 34 . ( 67 - 57 )

= 57 . 0 + 34 . 10

= 0 + 340

= 340

Đây là tính hợp lí nha mina mk ghi nhầm

Tách từng câu ra giùm, như này ai giải nổi:)))))

a) (26-6)*(-4)+31*(-7-13)

=-80+-620

=-700

hacker 2k6

\(a)\)

\(\left(-31\right)+\left(50-19\right)-\left(150-31\right)\)

\(=\left(-31\right)+50-19-150+31\)

\(=\left(-150\right)-19\)

\(=-169\)

\(b)\)

\(25.\left(45-17\right)-45.\left(25-17\right)\)

\(=25.45-25.17-45.25+45.17\)

\(=0\)

\(c)\)

\(\frac{-1}{12}+\frac{4}{3}=\frac{5}{4}\)

\(d)\)

\(3+\frac{-5}{20}+\frac{30}{75}+\frac{-7}{4}\)

\(=\left(\frac{3}{5}+\frac{30}{75}\right)-\left(\frac{5}{20}+\frac{7}{4}\right)\)

\(=1-2\)

\(=-1\)

a) (-31)+(50-19)-(150-31)

= (-31)+50+(-19)-150+(-31)
= (-31)+50-150+(-19)-(-31)
= (-31)+(-100)+12
= -119
b) 25(45-17)-45(25-17)
= 25.45-25.17-45.25-45.17
= 25(45-45)-25(17-17)
= 0
c) -1/12 + 4/3
= -1/12 + 16/12
= 15/12
= 5/4
d) 3/5+(-5)/20+30/75+(-7)/4
= 45/75+30/75+(-5)/20+(-35)/20
= 1+(-2)
= -1

1: \(44\cdot\left(-50\right)-50\cdot56\)

\(=-50\cdot\left(44+56\right)\)

\(=-50\cdot100=-5000\)

2: \(31\cdot72-31\cdot70-31\)

\(=31\left(72-70-1\right)\)

\(=31\cdot1=31\)

3: \(-67\cdot\left(1-301\right)-301\cdot67\)

\(=-67\cdot1+67\cdot301-67\cdot301\)

=-67

4: \(\left(-3879-3879-3879-3879\right)\cdot\left(-25\right)\)

\(=3879\cdot4\cdot25\)

\(=3879\cdot100=387900\)

5: \(\left(-2\right)^4\cdot289-16\cdot189\)

\(=16\cdot289-16\cdot189\)

\(=16\cdot\left(289-189\right)=16\cdot100=1600\)

6: \(\left(-8\right)^2\cdot19+19\cdot\left(-6\right)^2\)

\(=19\cdot\left(64+36\right)\)

\(=19\cdot100=1900\)

Trả lời

b)(1/3+12/67+13/41)-(79/67-28/41)

=1/3+12/67+13/41-79/67+28/41

=1/3+(12/67-79/67)+(13/41+28/41)

=1/3+(-67/67)+41/41

=1/3+(-1)+1

=1/3+0

=1/3.

c)38/45-(8/45-17/51-3/11)

=38/45-8/45+17/51+3/11

=30/45+1/3+3/11

=2/3+1/3+3/11

=3/3+3/11

=1+3/11

=1 3/11.