32×9= 56×20= 87×4= 903÷3=110÷5= 405÷5= 80×3+27= 800﹣25×4=
能简算的要简算+++×(+)÷(3﹣﹣)÷[﹣(+)]
简便运算. 578﹣298 3.64÷4+4.36×25% 23.5+99×23.5.
21×42+21×63﹣21×5= .
(7.88+6.77+5.66)×(9.31+10.98+10)﹣(7.88+6.77+5.66+10)×(9.31+10.98)= .
10×+17×75%﹣7×0.75.