用递等式计算（能简算的要简算） 20.9+10.5÷（5.2-3.5）3.5×0.7+5.5×
用递等式计算（能简算的要简算）20.9+10.5÷（5.2-3.5）3.5×0.7+5.5×0.710.64+7.65×2.4+11.760.125×3.2×0.25．...
用递等式计算（能简算的要简算） 20.9+10.5÷（5.2-3.5）3.5×0.7+5.5×0.710.64+7.65×2.4+11.760.125×3.2×0.25．
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①20.9+10.5÷（5.2-3.5）
=20.9+10.5÷1.7
≈20.9+6.18
=27.08
②3.5×0.7+5.5×0.7
=（3.5+5.5）×0.7
=9×0.7
=6.3
③10.64+7.65×2.4+11.76
=10.64+18.36+11.76
=（10.64+11.76）+18.36
=22.4+18.36
=40.76
④0.125×3.2×0.25
=0.125×（8×0.4）×0.25
=（0.125×8）×（0.4×0.25）
=1×0.1
=0.1
=20.9+10.5÷1.7
≈20.9+6.18
=27.08
②3.5×0.7+5.5×0.7
=（3.5+5.5）×0.7
=9×0.7
=6.3
③10.64+7.65×2.4+11.76
=10.64+18.36+11.76
=（10.64+11.76）+18.36
=22.4+18.36
=40.76
④0.125×3.2×0.25
=0.125×（8×0.4）×0.25
=（0.125×8）×（0.4×0.25）
=1×0.1
=0.1
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