①78-360÷9+215
②125×32×25
③7.65-2.9-3.1
④409×99+409
⑤320÷8÷4
⑥840×[128-(151-31)]
0.7+2.61.9+2.6
2.8+3.63.6+2.8
4-3.5+0.54-(3.5+0.5)
7.5-3.3+0.57.5-0.5+3.3
480÷6=
23×0=
56÷7-8=
35+65÷5=
150×4=
840÷40=
36×5×0=
78-(14+56)=
24+11×47 101×54﹣54
630÷35÷2 20×[(1100﹣180)÷40]
①827-156-44
②45×99
③3.3+6.4+2.7+4.6
④5600÷25÷4
⑤81+9×91
⑥21×[(75+153)÷38]
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
①483.48-(83.48+25.1)
②99×82+82
③65×19.25+0.75×65
④25.44-3.29-9.71
⑤32×7×253
⑥25.98+62.7-25.98+37.3