A:2x+1﹣(10x+1)=1
B:4x+1﹣10x+1=6
C:4x+2﹣10x﹣1=6
D:2(2x+1)﹣(10x+1)=1
408+4=____ 408-4=____ 408×4=____
408÷4=____ 123×3=____ 123÷3=____