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简介:
399.6×9-1998×0.8
= 399.6×9-1998×2×0.4
= 399.6×9-399.6×4
= 399.6×5
=1998
25.9-6.47-3.53
=25.9-(6.47+3.53)
=25.9-10
=15.9
0.5×7.49×2
=0.5×2×7.49
=1×7.49
=7.49
0.45×101
=0.45×(100+1)
=0.45×100+0.45×1
=45+0.45
=45.45
8.8×12.5
=1.1×(8×12.5)
=1.1×100
=110
25×0.125×8
=25×(0.125×8)
=25×1
=25
5.34×99+5.34
=5.34×(99+1)
=5.34×100
=534
98.9×100.1
=98.9×(100+0.1)
=98.9×100+98.9×0.1
=9890+9.89
=9899.89