①317-57+283-143
②78×68+32×78
③99×49+49
④629-(134+329)
⑤125×88
⑥27+73×135
①96+4×105
②38×35+62×35
③38.23-(1.23+5.9)
④25×32×125
⑤1200÷25×4
⑥63.05-8.83+0.95-2.17
⑦100+87×125+25
⑧900÷[(58-33)×3]