给算式添上括号,使运算顺序为:加→减→除→乘48.6+43.2÷3.6﹣1.2×0.4.
304-275÷(275÷25) (252-14)÷17-10
7.9×11-7.9 0.99×9+0.99
199.8×19.99-199.9×19.97 (10-100÷10)×11=
4.83×0.59+0.41×1.59-0.324×5.9 (346-10)÷16-12
49×50≈89×41≈10×42≈ 20×32≈10×21≈30×32≈