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(-9000)-500+700=
(-9500)+700=8800
2)(-4500)÷(-30)+8×(-300)-1500=
150+(-2400)-1500=
150+(-3900)=(-3750)
3)600+80×(-9)+1800÷25=
600+(-720)+72=
(-120)+72=(-48)
4)2400-6000÷20+40×(-75)=
2400-300+(-3000)=
2100+(-3000)=(-900)
5)8000÷50-700×(-9)-900=
160-(-6300)-900=
160+6300-900=
6460-900=5560