直接写得数(共5分,每题0.5分) ①452+98= ; ②1.25×8= ; ③640÷16= ;④×÷×= ; ⑤5.01﹣1.8= ;⑥0.25×0.4= ; ⑦0.88+0.12= ;⑧6.5+9.5+3.5= ; ⑨×0.7+0.8= ;⑩2-×= .
(-5)×(-8)-(-28)÷4-2-(-2)-2×(-1)+|-4|×0.5+2×(-1)
计算:.
计算:-13-(1-0.5)××[2-(-3)2].
计算:(每小题4分,共24分) (1) (2) (3) (4) (5)(6)