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Quan Nguyen
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2024-05-05 16:19:24
số học sinh loại tốt là
45.4/15=12(học sinh)
số học sinh loại khá là
12.5/3=20(học sinh)
số học sinh loai đạt là
45-12-20=13(học sinh)
đáp số 13 học sinh
2024-05-05 16:13:25
a,1/2-1/2:x=3/4
1/2:x=1/2-3/4
1/2:x=-1/4
x=1/2:-1/4
x=-2
vậy x=-2
c,x+2,5=1,4
x=1,4-2,5
x=1,1
vậy x=1,1
2024-05-05 16:01:40
a=2,34+5,35+7,66+4,65
a=(2,34+7,66)+(5,35+4,65)
a=10+9
a=19
b=2,13.75+2,13.25
b=2,13.(75+25)
b=2,13.100
b=213
c=1/3-1/3:3/4
c=0:3/4
c=0.4/3
c=0