题参考答案一.选择题(共5小题)1.C 2.D.3.A.4.A.5.B.二.填空题(共5小题)6. x≤ .7. 2017 .8. 3 .9. .10. 3 .三.解答题(共6小题)11. 2 ; 5a ; . 1 , 3 , 4 .12.解:(1) × =3 ; (2) × = = =6.(3) = × =11×6=66.(4) .= × = × = .13.解:(1)原式=3 ×5 × =15. (2)原式= = = 8=4.(3)原式= = . (4)原式=12 ﹣4 =8 .(5)原式=3 ﹣4 + =0. (6)原式= × = .14.解:(1)原式=4 ÷ ×3 =8×3 =24 .(2)原式=2 × × = × × =6.(3)原式= ÷ = . (4)原式= = =20.(5)原式=3 ﹣ +2 = .(6)原式=4 ﹣6× +4 =8 ﹣2 =6 15.解:(1)原式= |