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=426 - 512 + 6912
=6.826
2.19×27 + 5.205 ÷15 - 269
=513 + 347 - 569
=291
3.(-9) - 6 × (-72) : 16 -20
=(-9)-6×(-4,5)-20
=-9+27-20
=-2
4.168:((17-24) × (-19+15))
=168÷((-7)×(-4))
=168÷28
=6
2.) (19×27)+(5.205:15)-269=513+347-269=591
3.) (-9)-(6×-72):16-20=(-9)-(-432:16)-20=(-9)-(-27)-20=(-9)+27-20=-2
4.)168:(-7×-4)=168:28=6