bài 1: Cho biểu thức A= 1/x-2 + x2 - x-2 / x2 - 7x + 10 - 2x - 2x-4 / x-5 a, rút gọn A b, tìm x để A=1 c, tìm x nguyên để A nguyên bài 2: Cho biểu thức : M= x2 + 2x/ 2x+10 + x-5/x + 50-5x / 2x(x+5) a, rút gọn M b, tính M khi x=3; x=5 GIÚP MK NHA MAI CÔ GIÁO KIỂM TRA RỒI
bài 1: viết câu điều kiện 1. he will be very sad unless she phones him 2. unless mary gives us a hand, we won't do this 3. that man doesn't work hard. he can't sarn more money 4. i don't tell her the answer because she is away from home 5. the weather isn't better now, so we can't go for a work 6. i don't now his adolress, and i don't send it. to him 7. the doctor can't see many patients because he in so late 8. tom is tired so she can't rat 9. i don't have a bike so i can't go for the picnic 10. your don't ask me so i don't lend you my car