Tính hợp lý
1/(-8) – [(-5) + 8]
2/25.134+25.(-34)
3/-23.63+23.21-58.23
Tính hợp lý 1/(-8) – [(-5) + 8] 2/25.134+25.(-34) 3/-23.63+23.21-58.23
By Melody
By Melody
Tính hợp lý
1/(-8) – [(-5) + 8]
2/25.134+25.(-34)
3/-23.63+23.21-58.23
1. $(-8) – [(-5) + 8]=(-8)-3=-11 ^{}$
2. $25.134+25.(-34)=25.(134-34)=25.100=2500^{}$
3. $-23.63+23.21-58.23^{}=23(-63+21-58)=23.(-100)=-2300$
1, (-8) – [(-5) + 8]
=-8+5-8
=(-8-8)+5
=-16+5
=-11
2, 25.134+25.(-34)
=25.(134-34)
=25.100
=2500
3, -23.63+23.21-58.23
=23.(-63+21-58)
=23.(-100)
=-2300