Номер 227 плиз помогите

X*10=45000. 1). x:100=4000
x=45000:10. x=4000*100
x=4500. x=40
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100*x=45000. 2)
x=450000:100
x=450
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x+190=400 3)
x=400-190
x=210
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4000/x=100
x=4000/100
x=40
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x-190=400
x=400+190
x=590
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