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\(-\frac{1}{2}<\frac{x}{24}<\frac{y}{12}<\frac{z}{8}\Leftrightarrow-\frac{24}{48}<\frac{2x}{48}<\frac{4y}{48}<\frac{6z}{48}\)
Có thể tìm được rất nhiều các số nguyên x;y;z thỏa mãn
P=y-[y-(2x-x-y)]=y-[y-x+y]=y-y+ x-y=x-y
Q=y-[y-x+2x-2y]=y-[-y+x]=y+y-x=2y-x
=>P+Q=x-y+2y-x=(x-x)+(2y-y)=y
=>P-Q=(x-y)-(2y-x)=x-y-2y+x=2x-3y
Complete the sentences with the suitable wrord the suitable word from the box
avoid invested generate reduce converted
1. Solar power can be ................ into electricity
2. Fossil fuels can be used to.......... electricity or drive big machinery
3. use electricity economically so that we can....... our electricity bills
4.We should............ using cars or motorbike for short trips
5. Businesses have..... more money in renewable energy in recent years
1. Solar power can be converted into electricity
2. Fossil fuels can be used to generate electricity or drive big machinery
3. use electricity economically so that we can reduce our electricity bills
4.We should avoid using cars or motorbike for short trips
5. Businesses have invested more money in renewable energy in recent years