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1 Children didn't plant more trees
Did children plant more trees?
2 Tom wasn't a member of the Youth Club
Was Tom a member of the Youth Club?
3 The school wasn't closed due to the snow
Was the school closed due to the snow?
4 The organization didn't provide shelter for the children
Did the organization provide shelter for the children?
5 Tom didn't go to the hospital to provide food two weeks ago
Did Tom go to the hospital to provide food two weeks ago?
- (+) Children planted more trees.
(–) Children did not plant more trees.
(?) Did children plant more trees? - (+) Tom was a member of the Youth Club.
(–) Tom was not a member of the Youth Club.
(?) Was Tom a member of the Youth Club? - (+) The school was closed due to the snow.
(–) The school was not closed due to the snow.
(?) Was the school closed due to the snow? - (+) The organisation provided shelter for the children.
(–) The organisation did not provide shelter for the children.
(?) Did the organisation provide shelter for the children? - (+) They were at school this morning.
(–) They were not at school this morning.
(?) Were they at school this morning? - (+) Tom went to the hospital to provide food two weeks ago.
(–) Tom did not go to the hospital to provide food two weeks ago.
(?) Did Tom go to the hospital to provide food two weeks ago?
Kim loại Natri (Na) tuyệt đối không được bảo quản trong nước vì nó có tính khử rất mạnh và sẽ xảy ra phản ứng hóa học dữ dội ngay lập tức khi tiếp xúc.
Giải:
Theo bài ra ta có sơ đồ:
Theo sơ đồ ta có:
Đáy bé là: 20:(5 - 3) x 3 = 30(cm)
Đáy lớn là: 30 + 20 = 50(cm)
Diện tích hình thang là:
(30 + 50) x 40 : 2 = 1600(cm\(^2\))
Đáp số: 1600cm\(^2\)
5−3=2 (phần) Giá trị của một phần là:
20∶2=10 (cm)
Độ dài đáy bé là:10×3=30 (cm)
Độ dài đáy lớn là:
30+20=50(cm)
Diện tích hình thang là:(50+30)×40 : 2=1600(cm²) Đáp số: 1600 cm²
`2x - 2/3 -3x + 3/2 =x/2`
`-x+5/6=x/2`
`5/6=x/2+x`
`5/6=3/2 x`
`x=5/6 : 3/2=5/9`
Ta có phương trình: \(2x-\frac{2}{3}-3x+\frac{3}{2}=\frac{x}{2}\).Nhóm các hạng tử chứa \(x\) và các hằng số ở vế trái:\((2x-3x)+\left(\frac{3}{2}-\frac{2}{3}\right)=\frac{x}{2}\)\(-x+\left(\frac{9}{6}-\frac{4}{6}\right)=\frac{x}{2}\)\(-x+\frac{5}{6}=\frac{x}{2}\)Chuyển \(-x\) từ vế trái sang vế phải (đổi dấu thành \(+x\)):\(\frac{5}{6}=\frac{x}{2}+x\)Quy đồng mẫu số ở vế phải:\(\frac{5}{6}=\frac{x}{2}+\frac{2x}{2}\)\(\frac{5}{6}=\frac{3x}{2}\)Để tìm \(x\), ta nhân cả hai vế với \(2\):\(\frac{5\cdot 2}{6}=3x\)\(\frac{10}{6}=3x\)\(\frac{5}{3}=3x\)Chia cả hai vế cho \(3\):\(x=\frac{5}{3\cdot 3}\)\(x=\frac{5}{9}\)




nô
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