用递等式计算下面各题.(1)4789﹣5768÷56×27 (2)(5.1÷0.17+4.2)×4.5(3)(0.75﹣)×(+) (4)÷〔(+)×〕
口算.1.1×0.8= 7.2÷1.2= 3.2×0.5=1×0.01= 3.2×50= 1.9+5.1=1.25÷0.25= 6.7﹣1.2= 7.2﹣1.2=
用竖式计算下面各题,并用计算器验算7.32×4.5 5÷1 2 4÷0.99.744÷4.8 34.8+3.9(得数保留两位小数)
口算.2.5+3= 5.3×2= 2.5×3= 1﹣0.53= 9.6+3.4=0.25×16= 9.6×2= 3.2×1.25= 9.6÷0.2=
7.56×10= 7.36×10= 0.84×100= 8÷100= 100.3÷100=0.8÷10= 7.9×100= 0.07×1000= 3.4÷100×10=
口算.8÷5= 0.72÷0.8= 0.25÷0.5= 0.5÷4=1.25×10= 0.5÷2= 0×l0.5= 0.8×12.5=0.4×0.7= 3÷1.5= 1.6÷0.04= 0÷2.1=