ko

6. A hospital will be built in our city in the future.
7. Wind energy will be used to reduce pollution.
8. I will be taught how to use electricity by Mai.
9. Smoke won't be created by gas so we should use it.
10. Alternative sources of energy will be used in the future.

ko bé ơi

''What country does your friend come from?''=> Bill asked me what country my friend came from.

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lỗi

15/14 = 12/14

Đáp án:
X-5/7=3/5 x 1/2

x - 5/7 = 3/10

x = 3/10   +5/7

x = 71/70

C