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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
12.9÷0.72+43.5÷3.6
=(12.9×5)÷(0.72×5)+43.5÷3.6
=64.5÷3.6+43.5÷3.6
=(64.5+43.5)÷3.6
=30
49.5×13.5-0.5×49.5+50.5×13
=49.5×(13.5-0.5)+50.5×13
=49.5×13+50.5×13
=(49.5+50.5)×13
=1300