472﹢819﹣172
954﹣187﹣654
139×18﹣39×18
84﹣(456﹢408)÷24
(214﹢76)×(39﹣27)
402÷6×13﹣287.
①122﹣36+64
=122﹣(36+64)
=122﹣100
=22 订正:①
②99×25
=(100﹣1)×25
=100﹣1×25
=75 订正:②
③720÷(8×3)
=720÷8×3
=90×3
=270 订正:③
试题篮
()