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简介:
1)8.2×99+8.2
=8.2×(99+1)
=8.2×100
=820
2)8.8×12.5
=(8+0.8)×12.5
=100+10
=110
3)12.5×3.4×0.8
=12.5×0.8×3.4
=10×3.4
=34
4)0.78×9.9
=0.78×(10-0.1)
=0.78×10-0.78×0.1
=7.8-0.078
=7.722
5)16×12.5×4.3
=2×8×12.5×4.3
=(2×4.3)×(8×12.5)
=8.6×100
=860
6)0.34×101
=0.34×(100+1)
=0.34×100+0.34
=34+0.34
=34.34