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

Toán Lớp 6: a)(29.9).(-9)+(-13-7).21 b)(-157).(127-316)-127.(316-157) c)4.(1930+2019)+4.(-2019) d)(-3).(-17)+3.(120-17) i)(-8).72+8.(-19)-(-8) g)(-

Home/ Toán Lớp 6: a)(29.9).(-9)+(-13-7).21 b)(-157).(127-316)-127.(316-157) c)4.(1930+2019)+4.(-2019) d)(-3).(-17)+3.(120-17) i)(-8).72+8.(-19)-(-8) g)(-

Toán Lớp 6: a)(29.9).(-9)+(-13-7).21 b)(-157).(127-316)-127.(316-157) c)4.(1930+2019)+4.(-2019) d)(-3).(-17)+3.(120-17) i)(-8).72+8.(-19)-(-8) g)(-

Tháng Bảy 11, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: a)(29.9).(-9)+(-13-7).21
b)(-157).(127-316)-127.(316-157)
c)4.(1930+2019)+4.(-2019)
d)(-3).(-17)+3.(120-17)
i)(-8).72+8.(-19)-(-8)
g)(-27).1011-27.(-12)+27.(-1)

Comments ( 2 )

  1. thudan
    thudan
    11 Tháng Bảy, 2022 at 12:44 sáng
    Reply
    a) (29 – 9). (-9) + (-13 – 7). 21
    = 20. (-9) + [- (13 + 7). 21]
    = 20. (-9) + (-20). 21
    = (-20). 9 + (-20). 21
    = (-20). (9 + 21)
    = (-20). 30
    = – (20. 30)
    = – 600.
    b) (-157). (127 – 316) – 127. (316 – 157)
    = (- 157). 127 + (-157). (-316) + (–127). 316 + (-127). (-157)
    = -157. 127 + 157. 316 – 127. 316 + 127. 157
    = [- (127. 157) + 127. 157] + (157. 316 – 127. 316)
    = 0 + 316. (157 – 127)
    = 316. 30
    = 9 480.
    c) 4.(1 930 + 2 019) + 4.(-2 019)
    = 4.(1 930 + 2 019 – 2 019)
    = 4.1 930
    = 7 720
    d) (-3).(-17) + 3.(120 – 17)
    = 3.17 + 3.(120 – 17)
    = 3.(17 + 120 – 17)
    = 3.120
    = 360
    i) (-8).72 + 8.(-19) – (-8)
    = (-8).72 + (-8).19 – (-8) 
    = (-8).(72 + 19 – 1)
    = (-8).90 = -720
    g) (-27).1011 –  27.(-12) + 27.(-1)
    = 27.(-1011) – 27(-12) + 27.(-1)
    = 27.(-1011 + 12 – 1)
    = 27.(-1000) = -27000
     
    cho mình 5* nha
     

  2. phuongthaongoc
    phuongthaongoc
    11 Tháng Bảy, 2022 at 12:44 sáng
    Reply
    a, (29. 9). (-9) + (-13 – 7). 21
    = 261. (-9) – 20. 21
    = -2349 – 420
    = -2769
    b, (-157). (127 – 316) – 127. (316 – 157)
    = (-157). 127 + (-157). (-316) + (-127). 316 + (-217). (-157)
    = -157. 127 + 157. 316 – 127. 316 + 127. 157
    = [-(127. 157) + 127. 157] + (157. 316 – 127. 316)
    = 0 + 316. (157 – 127)
    = 316. 30
    = 9480
    c, 4. (1930 + 2019) + 4. (-2019)
    = 4. 3949 + 4. (-2019)
    = 4. (3949 – 2019)
    = 4. 1930
    = 7720
    d, (-3). (-17) + 3. (120 – 17)
    = 3. (17 + 120 – 17)
    = 3. (17 – 17 + 120)
    = 3. (0 + 120)
    = 3. 120
    = 360
    i, (-8). 72 + 8. (-19) – (-8)
    = (-8). 72 + (-8). 19 – (-8). 1
    = (-8). (72 + 19 – 1)
    = (-8). 90
    = -720
    g, (-27). 1011 – 27. (-12) + 27. (-1)
    = (-27). 1011 – 27. (-12) + 27. (-1)
    = (-27). 1011 – (-27). 12 + (-27). 1
    = -27. (1011 – 12 + 1)
    = -27. 1000
    = -27000
    #Mon
     

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

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