,简便运算 6.28+5.74+3.72+5.26 48-6.2+6.2+52 25+1.2 16.9-5.6-4.4 9.8-(5.7+1.8) 5.8×99+5.8 360÷(1.2÷50) (40+1.25)×8 483+199 246-98 246+102 846-102 5.7×99 125×32 480÷72 99+0.1 110-10.1 2.1+0.9 二,...