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lololoshka656
@lololoshka656
December 2021
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ПОМОГИТЕ ПОЖАЛУЙСТА И СРОЧНООО,УМОЛЯЮ
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natalitaranuch
№ 1229
а) 0,8*(-0,3)-0,6*(-0,3)=(-0,3)*(0,8-0,6)=-0,3*0,2=-0,06
б) -3/11*0,4-0,4*(-8/11)=0,4*(-3/11-(-8/11)=0,4*(-3/11+8/11)=0,4*5/11=4/10*5/11=2/11
в) -7/8*4/9+4/9*1/8=4/9(-7/8+1/8)=4/9*(-6/8)=-1/3
г) 2 2/9*3,7-2 2/9*(-5,3)=2 2/9*(3,7-(-5,3))=2 2/9*(3,7+5,3)=2 2/9*9=20
д) (-1 1/2- 1 1/7)*14=(-1 7/14-1 2/14)*14=-2 9/14*14=-37
е) (2/5-3/4)*20=(8/20-15/20)*20=-7/20*20=-7
№ 1214
а) 0,3*(-0,6) - (-0,7)*(-0,6)
(-0,6)*(0,3-(-0,7))=(-0,6)*(0,3+0,7)=-0,6
б) 8*(-1/3)+7*(-1/3)=(-1/3)*(8+7)=-1/3*15=-5
в) -2/11*0,8+0,3*(-2/11)=(-2/11)*(0,8+0,3)=-2/11*1,1=-2/11*11/10=-1/5
г) (-2/7-3/4) *-28=(-8/28-21/28)*-28=-29/28*-28=29
№ 1250
а) 35-8+14-35+8-14=(35-35)+(14-14)+(8-8)=0
б) 2/3+0,4-2/3-0,6=(2/3-2/3)+(0,4-0,6)=-0,2
в) -2/3*4/7*1 1/2=-2/3*4/7*3/2=-2/3*3/2*4/7=-1*4/7=-4/7
г) -5/7*(-3,2)*1 2/5*(-10)=-5/7*(-3,2)*7/5*(-10)=-5/7*7/5*(-3,2)*(-10)=
-1*(-3,2)*(-10)=-32
д) 3/5*6/7+3/5*(-1/7)=3/5*(6/7+(-1/7))=3/5*5/7=3/7
е) (2/5+1/7)*(-35)=2/5*(-35)+1/7*(-35)=-14-5=-19
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Answers & Comments
а) 0,8*(-0,3)-0,6*(-0,3)=(-0,3)*(0,8-0,6)=-0,3*0,2=-0,06
б) -3/11*0,4-0,4*(-8/11)=0,4*(-3/11-(-8/11)=0,4*(-3/11+8/11)=0,4*5/11=4/10*5/11=2/11
в) -7/8*4/9+4/9*1/8=4/9(-7/8+1/8)=4/9*(-6/8)=-1/3
г) 2 2/9*3,7-2 2/9*(-5,3)=2 2/9*(3,7-(-5,3))=2 2/9*(3,7+5,3)=2 2/9*9=20
д) (-1 1/2- 1 1/7)*14=(-1 7/14-1 2/14)*14=-2 9/14*14=-37
е) (2/5-3/4)*20=(8/20-15/20)*20=-7/20*20=-7
№ 1214
а) 0,3*(-0,6) - (-0,7)*(-0,6)
(-0,6)*(0,3-(-0,7))=(-0,6)*(0,3+0,7)=-0,6
б) 8*(-1/3)+7*(-1/3)=(-1/3)*(8+7)=-1/3*15=-5
в) -2/11*0,8+0,3*(-2/11)=(-2/11)*(0,8+0,3)=-2/11*1,1=-2/11*11/10=-1/5
г) (-2/7-3/4) *-28=(-8/28-21/28)*-28=-29/28*-28=29
№ 1250
а) 35-8+14-35+8-14=(35-35)+(14-14)+(8-8)=0
б) 2/3+0,4-2/3-0,6=(2/3-2/3)+(0,4-0,6)=-0,2
в) -2/3*4/7*1 1/2=-2/3*4/7*3/2=-2/3*3/2*4/7=-1*4/7=-4/7
г) -5/7*(-3,2)*1 2/5*(-10)=-5/7*(-3,2)*7/5*(-10)=-5/7*7/5*(-3,2)*(-10)=
-1*(-3,2)*(-10)=-32
д) 3/5*6/7+3/5*(-1/7)=3/5*(6/7+(-1/7))=3/5*5/7=3/7
е) (2/5+1/7)*(-35)=2/5*(-35)+1/7*(-35)=-14-5=-19