计算 199.8+19.98+1.998+2.222

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计算199.8+19.98+1.998+2.222计算199.8+19.98+1.998+2.222计算199.8+19.98+1.998+2.222199.8+19.98+1.998+2.222=1

计算 199.8+19.98+1.998+2.222
计算 199.8+19.98+1.998+2.222

计算 199.8+19.98+1.998+2.222
199.8+19.98+1.998+2.222
=199.8+19.98+1.998+(2+0.2+0.02+0.002)
=(199.8+0.2)+(19.98+0.02)+(1.998+0.002)+2
=224

=199.8+0.2+19.98+0.02+1.998+0.002+2
=200+20+2+2=224
我是这样想的,利用拆分法

=abc

123

0.1+0.2+0.3等于0.4

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