计算:.
=
解下列方程或比例(每题3分,共12分) (1):=:x (2)= (3)2x﹣=0.5 (4)x+x=
计算下面各题,能简算的要简算(每题3分,共18分) (1)884÷34+17×21 (2)1.25×3.2×0.25 (3)()÷+ (4)4÷5+39× (5)4.2﹣1.38+5.8﹣4.62 (6)2÷﹣÷2.
直接写得数(每题1分,共12分) (1)3.2÷0.1= (2)48×= (3)1﹣= (4)0.125÷= (5)0.5÷1%= (6)0.5×40= (7)3989÷49≈ (8)++= (9)99×1.5+1.5= (10)8×(12+0.5)= (11)(﹣)×18= (12)7.5﹣(2.5+3.8)=