42300÷300(巧算)(递等式)

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42300÷300(巧算)(递等式)

42300÷300(巧算)(递等式)
42300÷300(巧算)(递等式)

42300÷300(巧算)(递等式)
42300÷300
=(30000+12000+300)÷300
=100+40+1
=141

42300÷300
=(42000+300)÷300
=42000÷300+300÷300
=140+1
=141

(1)j加减法简变运算:
427-238+138+473-95
=(427+473)-(238-138)-95
=900-100-95
=705.
(2)乘除运算:
9999×9999+19999
=9999×(10000-1)+19999
=99990000-9999+19999
=99990000+10000
=100000000.
8÷7+9÷7+11÷7
=(8+9+11)÷7
=4.