如图,已知∠1=∠2,∠C=∠D,求证:△ABC≌△BAD.
计算
(1)
(2)
(3)
(4)
(5)(-1)3-
×[2-(-3)
]
(6)
计算
(1)-3-(-14)-10+(-2)
(2)102+(-2)2×(-5)
(3)(
-1
+
)÷(-
)
(4)-14-
×[2-(-3)2]
若2m=3,2n=2,则2m+2n=()
| A.12 | B.7 | C.6 | D.5 |
计算:①(-3)+(―4)―(+8)―(―9);
②―22―2×(―3)+
―(―1)2015;
③-81÷
×
÷(-16);
④-19×
-0.23×
-
×19×(-1)4+0.23×
×(-1)3.