简便运算.578﹣298 3.64÷4+4.36×25% 23.5+99×23.5.
直接写出得数÷3= ×15= 2﹣= ÷= 5÷=
直接写出得数= 1÷= ÷60%= ×15= =6.8÷10%= 4.5+= = 2﹣= =
计算75× ×13 × ×× ÷ × ×÷ × ÷ ÷÷ ÷ ÷21.
×= ÷6= ÷= 1÷=×= ﹣= += 6÷=0÷= ×= = =
直接写出得数.18×= ÷= 0.25×3.2×4= 32×(1﹣0.99)=25%×4= 0÷= ÷= ×÷×=