这两题的简便计算
展开全部
(1)9999x7778+3333x6666
=9999x7778+9999x2222
=9999x(7778+2222)
=9999x10000
=999900000
(2)5.6x69.32+138.64x0.05+693.2x0.43
=5.6x69.32+69.32x(2x0.05)+69.32x4.3
=(5.6+0.1+4.3)x69.32
=10x69.32
=693.2
=9999x7778+9999x2222
=9999x(7778+2222)
=9999x10000
=999900000
(2)5.6x69.32+138.64x0.05+693.2x0.43
=5.6x69.32+69.32x(2x0.05)+69.32x4.3
=(5.6+0.1+4.3)x69.32
=10x69.32
=693.2
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展开全部
=9999×7778+3333×3×2222
=9999(7778+2222)
=9999×10000
=99990000
=9999(7778+2222)
=9999×10000
=99990000
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