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9.9×4.5简便计算

9.9×4.5+0.45 =(9.9+0.1)×4.5 =10×4.5 =45 你好,本题已解答,如果满意 请点右下角“采纳答案”。

9.9x4.5+0.45 =9.9×4.5+4.5×0.1 =4.5×(9.9+0.1) =4.5×10 =45

(1)9.9×4.5 =(10-0.1)×4.5 =10×4.5-0.1×4.5 =45-0.45=44.55(2)108×1.25 =(100+8)×1.25 =100×1.25+8×1.25 =125+10=135(3)14.67×101-14.67=14.67×(101-1)=14.67×100=1467(4)1.25×3.2×25=1.25×8×0.4×25=(1.25×8)×(0.4×25)=10×10=...

=4.5×(10-0.1) =4.5×10 - 4.5×0.1 =45 - 0.45 =44.55

4.5*(10-0.1)+0.45 45-0.45+045 45

10-0.1

(1)9.9×4.5=(10-0.1)×4.5=10×4.5-0.1×4.5=45-0.45=44.55(2)108×1.25=(100+8)×1.25=100×1.25+8×1.25=125+10=135(3)14.67×101-14.67=14.67×(101-1)=14.67×100=1467(4)1.25×3.2×25=1.25×8×0.4×25=(1.25×8)×(0.4×25)=10×10=100(...

题干不全

8.55+0.45 =9

相当于4.5*(10-0.1) =4.5*10-4.5*0.1 =45-0.45 =44.55

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