Toán Lớp 6: Thực hiện phép tính (Hợp lí nếu có thể):
45.37 + 45.63 – 100
148.9 – 32.48
307 – [(180.40 – 160) : 22 + 9] : 2
12 + 3.{90 : [39 – (23 – 5)2]}
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Toán Lớp 6: Thực hiện phép tính (Hợp lí nếu có thể):
45.37 + 45.63 – 100
148.9 – 32.48
307 – [(180.40 – 160) : 22 + 9] : 2
12 + 3.{90 : [39 – (23 – 5)2]}
Comments ( 2 )
=45.100-100
=4500-100
=4400
=900+9.48-32.48
=900+48.(9-32)
=900+48.(-23)
=900+(-1104)
=-204
=307-(7040:22+9):2
=307-(320+9):2
=307-329:2
=307-164,5
=142,5
=12 + 3.{90 : [39 – 36]}
=12 + 3.{90 : 3}
=12 + 3.30
=12 + 90
=102
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45.37 + 45.63 – 100
=45.(37+63)-100
=45.100-100
=4500-100
=4400
2.
148.9 – 32.48
= 9.100+9.48-32.48
=900+9.48-32.48
=900+48.(9-32)
=900+48.(-23)
=900+(-1104)
=-204
3.
307 – [(180.40 – 160) : 22 + 9] : 2
=307-[(7200-160):22+9]:2
=307-(7040:22+9):2
=307-(320+9):2
=307-329:2
=307-164,5
=142,5
4.
12 + 3.{90 : [39 – (23 – 5)2]}
=12 + 3.{90 : [39 – 18 . 2]}
=12 + 3.{90 : [39 – 36]}
=12 + 3.{90 : 3}
=12 + 3.30
=12 + 90
=102
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