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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 7: Tính `1)` `sqrt{45} + sqrt{4}` `2)` `sqrt{0,25} – sqrt{0,01}` `3)` `sqrt{11/25} – sqrt{1/81}` `4)“2 – sqrt{0,36}`

Tháng Sáu 4, 2022 Toán học 2 Comments 0 views

Toán Lớp 7: Tính
1) sqrt{45} + sqrt{4}
2) sqrt{0,25} – sqrt{0,01}
3) sqrt{11/25} – sqrt{1/81}
4)2 – sqrt{0,36}

Comments ( 2 )

  1. aivilanlan
    aivilanlan
    4 Tháng Sáu, 2022 at 3:50 sáng
    Reply
    1) \sqrt{45} + \sqrt{4}
    =3.\sqrt{5} +2
    =2+3\sqrt{5}
    2) \sqrt{0,25} -\sqrt{0,01}
    =1/2-1/10
    =2/5
    3)\sqrt{11/25} – \sqrt{1/81}
    =\sqrt{11}/5-1/9
    =(-5+9.\sqrt{11})/45
    4)2- \sqrt{0,36}
    =2-3/5
    =7/5

  2. hienchaudiem
    hienchaudiem
    4 Tháng Sáu, 2022 at 3:50 sáng
    Reply
    $\#phnn$
    $1.$
    \sqrt{45}+\sqrt{4}
    =\sqrt{9.5}+\sqrt{4}
    =\sqrt{9}.\sqrt{5}+2
    =3.\sqrt{5}+2
    =3\sqrt{5}+2
    $2.$
    \sqrt{0,25}-\sqrt{0,01}
    =\sqrt{25/100}-\sqrt{1/100}
    =(\sqrt{25})/(\sqrt{100})-(\sqrt{1})/(\sqrt{100})
    =5/10-1/10
    =4/10
    =2/5

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222-9+11+12:2*14+14 = ? ( )

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