①(4.5﹣3.2× )÷
②4.4×25
③ ×[ -( -25%)]
= ﹣0.25= 0÷5=
= 5.4×= 80×0.7=
40×18﹣60÷15
(12.5×8﹣60)÷0.4
3.14×2.77+0.223×31.4
① ×58﹣58×
②525+450÷15
③200﹣12.8﹣7.2
④24÷ ×( ﹣ )
⑤2.5×1.25×0.8
⑥ ×[ +( ﹣25%)]
2-1=31;1+2+4+8+16+32=;1+2+4+8+16+32+64+128+256+512=;