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2024-01-01 21:30:28
a,21.843+157.21
=21.(843+157)
=21.1000
=21000
b,215+[43+(-238)]
=215+(-195)
=20
2023-12-23 23:20:35
chu vi của hình vuông là :4cm
diện tích của hình vuông là:4.4=16(cm2)
diện tích bốn hình thang cân (bằng nhau)phía ngoài hình vuông bằng:28-16=12(cm)
diện tích hình thang cân AEGB là :12:4=3
2023-12-23 23:12:06
a,25:x=-22-1
25:x=-4-1
25:x=-5
x=25:-5
x=-5
b,3.3.3(x+1)=-35
27.(x+1)=-243
x+1=-243:27
x+1=-9
x=-9-1
x=-10
2023-12-23 23:01:56
a,99-(-55):5+1
=99-(-11)+1
=110+1
=111
b,[(-35)+(-65)]+[127+73]
=(-100)+200
=100
2023-12-23 22:56:59
a,99-(74-129):5+20220.
=99-(-55):5+1
=99-(-11)+1
=110+1
=111
b,(-35)+127+(-65)+73
=[(-35)+(-65)]+[127+73]
=(-100)+200
=100