怎样简便就怎样算．①6.8×0.56+0.44×6.8 ②0.32×2.5×12.5 ③7.2÷0.5÷0.2...
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解决时间 2021-03-23 07:15
- 提问者网友：且恨且铭记
- 2021-03-22 13:13
怎样简便就怎样算．①6.8×0.56+0.44×6.8 ②0.32×2.5×12.5 ③7.2÷0.5÷0.2...
最佳答案
- 五星知识达人网友：猎心人
- 2021-03-22 13:39
①6.8×0.56+0.44×6.8
=（0.56+0.44）×6.8
=1×6.8
=6.8；
②0.32×2.5×12.5
=0.4×0.8×2.5×12.5
=0.4×2.5×（0.8×12.5）
=1×10
=10；
③7.2÷0.5÷0.2
=7.2÷（0.5×0.2）
=7.2÷0.1
=72；
④17.8×32+17.8×72-17.8×4
=（32+72-4）×17.8
=100×17.8
=1780；
⑤43×0.72+4.3×2.8
=4.3×7.2+4.3×2.8
=4.3×（7.2+2.8）
=4.3×10
=43．
=（0.56+0.44）×6.8
=1×6.8
=6.8；
②0.32×2.5×12.5
=0.4×0.8×2.5×12.5
=0.4×2.5×（0.8×12.5）
=1×10
=10；
③7.2÷0.5÷0.2
=7.2÷（0.5×0.2）
=7.2÷0.1
=72；
④17.8×32+17.8×72-17.8×4
=（32+72-4）×17.8
=100×17.8
=1780；
⑤43×0.72+4.3×2.8
=4.3×7.2+4.3×2.8
=4.3×（7.2+2.8）
=4.3×10
=43．
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