计算 25×2= 16×3= 20×30=300×200= 40×100= 50×200=
12.5×198÷(18÷8) 1.2×8.64+1.136×12﹣2×0.12×50.
计算:71×54+82×54﹣153×46 .
计算 (1)9999+999+99+9(2)1797﹣(797﹣215)(3)999×999+2999(4)125×4×8×25 (5)26×101(6)999×111+333×667(7)1+2+3+4+…+99+100.
能简算的要简算. 5×999+5+99×7+7+3×9+3+9999×778+333×666 15.6×13.1﹣15.6﹣15.6×2.1[20﹣(90.75÷6.6+2.25)]×11.6.
计算. ①125×64×25②57×99+62③384÷16×32④4673﹣867+567⑤462+3018+238+182.