Вычислите рациональным способом:19*42-42*16+16*40-40*13+13*38-38*10+10*36-36*7. Created by bguly. matematika-ru

Вычислите рациональным способом:19*42-42*16+16*40-40*13+13*38-38*10+10*36-36*7...

bguly @bguly

August 2021 1 11 Report

Вычислите рациональным способом:19*42-42*16+16*40-40*13+13*38-38*10+10*36-36*7

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SergFlint

Verified answer

19*42-42*16+16*40-40*13+13*38-38*10+10*36-36*7=
=(19*42-42*16)+(16*40-40*13)+(13*38-38*10)+(10*36-36*7)=
=42*(19-16)+40*(16-13)+38*(13-10)+36*(10-7)=
=42*3+40*3+38*3+36*3=(42+36+40+38)*3=(78+78)*3=156*3=468.

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Verified answer

otmette v tetradi tochku opostrojte okruzhnost s centrom v tochke ozakraste kr

mingalya uronila kuklu v rekuna kakom rasstoyanii ot lodki budet nahoditsya kukle95bb59ae0fe97e79d50e2debe854bb7 71046

delimoe v 3 raza bolshe delitelyachemu ravno chastnoebac9a44ecba870eb4364d2914696f9c3 36041

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v shkolnuyu biblioteku privezli 395 uchebnikov dlya 4 klassa i 505 dlya 5 klassavse

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