口算4×716=45×34=421×716=59-411=59×5=1512-78=57×2.1=113×0.12=112×13=12+23=7-11017=（34+0.25）×10=18×13=116-512=0.125×112×8=0.125×27×8=2.5+1110=149×1.8=34+0.-六年级数学
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