简便方法计算．21÷0.25÷0.4 3.5×0.7+5.5×0.7+0.7 &nbs...
简便方法计算．21÷0.25÷0.43.5×0.7+5.5×0.7+0.70.23×1020.125×3.2×0.2564×4.5+3.6×454×1.76×0.25．...
简便方法计算．21÷0.25÷0.4 3.5×0.7+5.5×0.7+0.7 0.23×1020.125×3.2×0.25 64×4.5+3.6×45 4×1.76×0.25．
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（1）21÷0.25÷4
=21÷（0.25×4）
=21÷1
=21
（2）3.5×0.7+5.5×0.7+0.7
=（3.5+5.5+1）×0.7
=10×0.7
=7
（3）0.23×102
=0.23×（100+2）
=0.23×100+0.23×2
=23+0.46
=23.46
（4）0.125×3.2×0.25
=（0.125×8）×（0.4×0.25）
=1×0.1
=0.1
（5）64×4.5+3.6×45
=64×4.5+36×4.5
=（64+36）×4.5
=100×45
=4500
（6）4×1.76×0.25
=（4×0.25）×1.76
=1×1.76
=1.76
=21÷（0.25×4）
=21÷1
=21
（2）3.5×0.7+5.5×0.7+0.7
=（3.5+5.5+1）×0.7
=10×0.7
=7
（3）0.23×102
=0.23×（100+2）
=0.23×100+0.23×2
=23+0.46
=23.46
（4）0.125×3.2×0.25
=（0.125×8）×（0.4×0.25）
=1×0.1
=0.1
（5）64×4.5+3.6×45
=64×4.5+36×4.5
=（64+36）×4.5
=100×45
=4500
（6）4×1.76×0.25
=（4×0.25）×1.76
=1×1.76
=1.76
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