①74×78+26×78
②101×99
③43.51+20.4+56.49+9.6
50.75-(4.75+0.88) 35×102 66-42÷7×6
33×4×25 15.09+21.3+4.91+7.7 840÷[25×(81-77)]
⑴90200009200000 ⑵28亿2800000000
⑶125×80250×40 ⑷10个一百万1亿
28×306=
213×42=
189×67=
①70+124÷4×20
②500-80÷8×32
③6400÷[(92-88)×16]
250×56×4 1200÷25÷4 88×125
99×38+38 16×23-6×23 67+263+43-163
3800÷50÷2 97×103-97×3 64×27+64×73
65×102 85×99+85 851-258-242