①3.6+14×45
②4.7×0.36+0.36×5.3
③2.5×32×1.25
④5.72-3.08-1.33
⑤53.2-6.3-3.7
⑥18.69-28.9×0.4
0.03+0.52= 3-0.3= 2.5×0.4= 0.4×0.7=
①83×101-83
②16.03-8.64-1.36
③120-6.9+3.1
④128+167+172+33
⑤350÷14×(276-254)
⑥44×25
①143+236+157
②28+136+264+172
③248-123-27
④167+49+33+151
⑤369-89-111
⑥486-76-24-186
142857×1=142857
142857×2=285714
142857×3=428571
142857×4=571428
142857×5=714285
根据规律,142857×6=。所以,我们把142857称为“走马灯数。
①305×29=
②590×700=
③※187×46=
④※353÷17=
①800÷25
②640÷40
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×