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

Toán Lớp 6: tính = cách hợp lí a)152+(-73)-(-18)-127 b)876+[100-724-(876-724)] c)(-3).(-18)+3(10-18)

Toán Lớp 6: tính = cách hợp lí
a)152+(-73)-(-18)-127
b)876+[100-724-(876-724)]
c)(-3).(-18)+3(10-18)

Comments ( 2 )

  1. a)=152-73+18-127
    =(152+18)-(73+127)
    =170-200
    =-30
    b)=876+100-724-876+724
    =(876-876)+(-724+-724)+100
    =0+0+100=100
    c)= [-3 .(-18)+ ( 3.18)]+3.10
    =0+30
    =30
     

  2. a) 152 + (-73) – (-18) – 127
    = 152 – 73 + 18 – 127
    = (152 + 18) – (73+127)
    = 170 – 200
    = -30
    b) 876 + [100 – 724 – (876 – 724)]
    = 876 + [100 – 724 – 876 + 724]
    = 876 + 100 – 724 – 876 + 724
    = (876 – 876) + (724 – 724) + 100
    = 100
    c) (-3) . (-18) + 3(10 – 18)
    = (-3) . [(-10) + (-8) + 3.10 – 3.18
    = (-3) . (-10) + (-3) . (-8) + 3.10 – 3.18
    = 3.10 + 3.8 + 3.10 – 3.18
    = 3.(10+8+10 – 18)
    = 3. 10
    = 30

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