a) 48*23-8*6*38

=48*23-48*38

=48(23-38)

=48*(-15)=-720

b)73-9*(-15+8)

=73+135-72=1+135=136

c) 29(19-13)-19(29-13)

=29*19-29*13-19*29+19*13

=13(-29+19)=13*(-10)=-130

d) 13*(23+22)-3(17+28)

=13*45-3*45

=45(13-3)=45*10=450

e) -35+35*(-26)+35*(-73)

=35*(-1)+35*(-26)+35*(-73)

=35(-1-26-73)

=35*(-100)=-3500

f) (-26)*38+45*(-26)+(-26)*17

=(-26)(38+45+17)

=(-26)*100

=-2600

g)33*(16-9)-16*(33-9)

=33*16-33*9-16*33+16*9

=9(-33+16)=9*(-17)=-153

a,D

b, A

D 

A

D

A

Câu 3: 

a: Chọn D

b: Chọn A

Câu 4: B

Câu 5:B

Câu 6: C

Câu 3: 

a: Chọn D

b: Chọn A

Câu 4: B

Câu 5: B

Câu 6: C

\(\dfrac{15}{17}\)

\(=\dfrac{15}{17}\left(\dfrac{45}{33}-\dfrac{12}{33}\right)=\dfrac{15}{17}\)

15/17

wow! mù mắt. Ido tính toán có khác!

C2:(32+1)x32:2=528

bạn tính thử xem đúng đấy.

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a) \(\left(-23\right)+13\left(-17\right)+57\)

\(=\left(-23\right)+\left(-221\right)+57\)

\(=-23-221+57\)

\(=-\left(23+221\right)+57\)

\(=-244+57\)

\(=-\left(244-57\right)\)

\(=-187\)

b) \(\left(-26\right)+\left(-6\right)+\left(-75\right)+\left(-50\right)\)

\(=-26-6-75-50\)

\(=-\left(26+6\right)-75-50\)

\(=-32-75-50\)

\(=-\left(32+75\right)-50\)

\(=-107-50\)

\(=-\left(107+50\right)\)

\(=-157\)

c) \(14+6+\left(-9\right)+\left(-14\right)\)

\(=14+6-9-14\)

\(=20-9-14\)

\(=11-14\)

\(=-3\)

d) \(\left(-123\right)+\left|13\right|+\left(-7\right)\)

\(=-123+13-7\)

\(=-\left(123-13\right)-7\)

\(=-110-7\)

\(=-\left(110+7\right)\)

\(=-117\)

e) \(\left|0\right|+\left|45\right|+\left(-\left|-455\right|\right)+\left|-796\right|\)

\(=0+45+\left(-455\right)-796\)

\(=45-455-796\)

\(=-410-796\)

\(=-\left(410+796\right)\)

\(=-1206\)

f) \(-\left|-33\right|+\left(-12\right)+18+\left|45-40\right|-57\)

\(=-33-12+18+\left|5\right|-57\)

\(=-\left(33+12\right)+18+5-57\)

\(=-45+18+5-57\)

\(=-\left(45-18\right)+5-57\)

\(=-27+5-57\)

\(=-\left(27-5\right)-57\)

\(=-22-57\)

\(=-\left(22+57\right)\)

\(=-79\)

(-23)+13(-17)+57

=(-23)-221+57

=218+57

=275

14+6+(-9)+(-14)

=20+(-9)+(-14)

=11+(-14)

=-3

15) $|-18| + (-12)=18-12=6$

16) $17+ |-33|=17+33=50$

17) $(– 20) + |-88|=-20+88=68$

18) $|-3| + |5|=3+5=8$

19) $|-37| + |15|=37+15=52$

20) $|-37| + (-|15|)=37-15=22$

21) $(-|-32|) + |5| 22)(-|-22|)+ (-|16|)=-32+5.22-22=-32+4.22=-32+88=56$

23) $(-23) + 13 + ( - 17) + 57=-23+13-17=-40+13=-23$

24) $14 + 6 + (-9) + (-14)=14+6-9-14=6-9=-3$

25) $(-123) +|-13|+ (-7)=-123+13-7=-110-7=-117$

26) $|0|+|45|+(-|-455)|+|-796|=0+45-455+796=-410+796=386$

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