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(1)9999×7778+6666×3333
=9999×7778+(6666÷3)×(3333×3)
=9999×7778+2222×9999
=9999×(7778+2222)
=9999×10000
=99990000
(2)5.6×69.32+138.64×0.05+693.2×0.43
=5.6×69.32+(138.64÷2)×(0.05×2)+(693.2÷10)×(0.43×10)
=5.6×69.32+69.32×0.1+69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
=9999×7778+(6666÷3)×(3333×3)
=9999×7778+2222×9999
=9999×(7778+2222)
=9999×10000
=99990000
(2)5.6×69.32+138.64×0.05+693.2×0.43
=5.6×69.32+(138.64÷2)×(0.05×2)+(693.2÷10)×(0.43×10)
=5.6×69.32+69.32×0.1+69.32×4.3
=69.32×(5.6+0.1+4.3)
=69.32×10
=693.2
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