78×21﹣531
672÷(2×3)
364+259÷7
①190-30×6
②28+72÷6
③(90-12)÷3
④24×(38+12)
①(-+)×24
②14.86﹣(6.28+2.36)﹣3.72
③÷[÷(-)]
④2.4×3.6+3.2×4.8
⑤+++......++
⑥××18×24
①3.86+6.4+2.14+7.6
②5.2÷0.32﹣0.12
③()×15
④
⑤
⑥
①12.5×(8+0.8)
②+×
③+÷
④26﹣7.28﹣12.72
⑤5.8×4.1+5.9×5.8
⑥÷(+1.4×)