写笔顺,数笔画。
“田”的笔顺是____ ,共____ 画。
在△ABC中,sinA·sinB=cos2C2,则△ABC的形状一定是 ( )
0.14×2=____
14×0.2=____
0.14×0.2=____
已知t∈R,i为虚数单位,复数z1=3+4i,z2=t+i,且z1•z2是实数,则t等于( )
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