Toán Lớp 6: tìm số tự nhiên x,biết :a,70-5.(x-3)=45;b,10+2.x=4^5:4^3
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Toán Lớp 6: tìm số tự nhiên x,biết :a,70-5.(x-3)=45;b,10+2.x=4^5:4^3
Comments ( 2 )
70-5x+15=45
-5x=-40
x=-40:(-5)
x=8
b,10+2.x=4^5:4^3
10+2.x=$4^{5-3}$
10+2.x=4^2=16
2.x=16-10
2.x=6
x=6:2
x=3