Đáp án:1)7400
2)-202000
3)-2300
4)-5000
5)-3000
6)=8200
7)-6500
8)900000
9)-10000000
Giải thích các bước giải:
$1)(-74).(69+31)=100.(-74)=-7400$
$2) (-2020).(35+65)=(-2020).100=-202000$
$3) |-23|.59-159.|23|$
$=23.59-159.23
=23.(59-159)$
$=23.(-100)=-2300$
$4)(-47).[147+(-47)]+(-300)
=(-47).100-300=-5000$
$5)(-30).(72+31-3)=(-30).100=-3000$
$6)(-82).[-55+1+(-46)]=(-82).(-100) =8200$
$7)(-135).(41+24)+35.65
=(-135).65+35.65
=65.(-135+35)
=65.(-100)=-6500$
$8)[125.(-8)].[(-25).4].[9.1]
=(-1000).(-100).9=900000$
$9)[4.(-25)].[125.(-8)].[2.(-50)]
=(-100).(-1000).(-100)=-10000000$
