2.计算:30°15′×3+27°18′÷6要解题步骤!

问题描述:

2.计算:30°15′×3+27°18′÷6要解题步骤!

最容易理解的办法是先化成分再计算,最后再化回度分

30°15′×3+27°18′÷6
=30°x3+15′x3+24°÷6+(3°x60+18′)÷6
=90°+45′+4°+198′÷6
=90°+4°+45′+33′
=94°+(45′+33′)
=94°+78′
=94°+1°18′
=95°18′

30°15′×3+27°18′÷6
=90°45′+4°+(3×60+18)′÷6
=90°45′+4°33′
=94°78′
=95°18′