(1)解方程: x x + 2 = 2 x − 1 + 1 .
(2)解不等式组: 2 x − 4 > 0 x + 1 ⩽ 4 ( x − 2 )
(1)0.92×1.41+0.92×8.59 (2)×-× (3)1.3×11.6-1.6×1.3 (4)×11.6+18.4×
(1)÷2=(2)501-199= (3)500÷4=(4)×= (5)1-0.05=(6)3.8+7.2= (7)1÷0.125=(8)+= (9)2.06×12.5×8=(10)×0.4×= (11)-0.375=(12)12×﹙1+)=
(1-)(1-)(1-)…(1-)
×[-(-)]
1.8×8.6+1.8×1.3+18%