小升初数学期中必考简便计算拔尖测试
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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
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