A:S=2*i
B:S=2*i﹣1
C:S=2*i﹣2
D:S=2*i+4
They may be able to help childcare so that you can have a break.
“丝绸之路”是古代沟通东西方文明的桥梁。下列说法不正确的是( )
2×3读作____,表示____个____相加,还表示____个____相加。