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简介:
56.5×99+56.5 9.7×99+9.7 4.2×99+4.2
=56.5×99+56.5×1 =9.7×99+9.7×1 =4.2×99+4.2×1
=56.5×(99+1) =9.7×(99+1) =4.2×(99+1)
=56.5×100 =9.7×100 =4.2×100
=5650 =970 =420
0.25×8.5×4 12.5×0.96×0.8 0.5×0.34×0.6
=0.25×4×8.5 =12.5×0.8×0.96 =0.5×0.6×0.34
=1×8.5 =10×0.96 =0.3×0.34
=8.5 =9.6 =0.102