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Toán Lớp 7: a) x:4=36:x b) x/3=y/5;x+y=64 c) x:2=y:5;5y-2x=21 d) 3(x=1)=4(y-2);2x+7y=70

Home/ Toán Lớp 7: a) x:4=36:x b) x/3=y/5;x+y=64 c) x:2=y:5;5y-2x=21 d) 3(x=1)=4(y-2);2x+7y=70

Toán Lớp 7: a) x:4=36:x b) x/3=y/5;x+y=64 c) x:2=y:5;5y-2x=21 d) 3(x=1)=4(y-2);2x+7y=70

Kiều Nguyệt Tháng Một 25, 2023 Toán học 1 Comment 0 views

Toán Lớp 7: a) x:4=36:x
b) x/3=y/5;x+y=64
c) x:2=y:5;5y-2x=21
d) 3(x=1)=4(y-2);2x+7y=70

Comments ( 1 )

myngocla
25 Tháng Một, 2023 at 7:56 chiều

Reply

a) x/4=36/x

→x²=4.36

→x=±12

b)x/3=y/5;(x+y=64)

→5x=3y

→x=3y/5

→3y/5+y=64

→8y/5=64

→y=40

→x=3.40/5=24

c)x/2=y/5;(5y-2x=21)

→5x=2y

→x=2y/5

→5y-(2.2y)/5=21

→5y-4y/5=21

→21y/5=21

→y=5

→x=(2.5)/5=2

d)3(x-1)=4(y-2);(2x+7y=70)

→3x-3=4y-8

→3x-4y=-5

→3x=-5+4y

→x=(-5+4y)/3

→2.(-5+4y)/3+7y=70

→(29y-10)/3=70

→29y-10=210

→29y=220

→y=220/29

→x=(-5+4.220/29)/3=245/29

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