Question

四年级数学应用题68x34-67+68x67。 （42x25-25x28）x4

Answer 1

简便计算：
68x34-67+68x67
=68x34+68x67-67
=68x(34+67)-67
=68x(100+1)-67
=68x100+68x1-67
=6800+68-67
=6800+(68-67)
=6801
（42x25-25x28）x4
=42x25x4-25x28x4
=42x(25x4)-28x(25x4)
=42x100-28x100
=100x(42-28)
=100x14
=1400
已经很详细了，看得明白吗？

Answer 2

68x34-67+68x67
=68x34+68x67-67
=68x(34+67)-67
=68x(100+1)-67
=68x100+68x1-67
=6800+68-67
=6800+(68-67)
=6801
（42x25-25x28）x4
=42x25x4-25x28x4
=42x(25x4)-28x(25x4)
=42x100-28x100
=100x(42-28)
=100x14
=1400

Answer 3

68x34-67+68x67 (42x25-25x28)x4
=68x34-68+1+68x67 =25x(42-28)x4
=68x34-68x1+68x67+1 =25x4x(42-28)

=68x(34-1+67)+1 =100x14

=68x100+1 =1400

=6800+1
=6801

Answer 4

解：68x34-67+68x67
=68x（34+67）-67
=68x101-67
=6868-67
=6801
（42x25-25x28）x4
={25X(42-28)}x4
={25x14}x4
=25x4x14
=100x14
=1400

Answer 5

简便计算：68x34-67+68x67=68x34+68x67-67=68x(34+67)-67=68x(100+1)-67=68x100+68x1-67=6800+68-67=6800+(68-67)=6801（42x25-25x28）x4=42x25x4-25x28x4=42x(25x4)-28x(25x4)=42x100-28x100=100x(42-28)=100x14=1400