某件商品按每个5元的利润卖出4个钱数,与按每个20元的利润卖出3个的钱数一样多,这种商品每个成本是多少元?
(1)3.72×3.5+62.8×0.35 (2)9.9×8.6+0.86(3)15.02﹣6.8﹣1.02﹣3.2 (4)725÷0.125÷0.25÷32(5)8888888×77777777÷1111111÷2222222﹣9999999÷3333333.
4×2.5÷0.25×5.
20.06×65+380×2.006﹣2.006×30.
64×2.5×0.125 3×0.8+3×2.2 3.76÷0.4÷2.5(14.21+3.5)÷7 4.66×0.28+4.66×0.82﹣4.66 2.4+57.6÷36.
脱式计算.(能简算的要简算)15.58÷8.2﹣0.72 9.6+9.9×99 8×3.6+1.4×2.8 0.74×4×0.25×4.