845-349+155-351 76×48+51×76+76 99×99+199
8×4×125×25 48×125 (27+27+27+27)×25
186×101-186
25×(39×4)
①76.48﹣(16.48+9.6)
②101×79
③209+102÷(52﹣35)
④250×43×4