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78.7-17.7×3.6
=78.7-(18-0.3)×(4-0.4)
=78.7-(18×4-18×0.4-0.3×4+0.3×0.4)
=78.7-(72-7.2-1.2+0.12)
=78.7-72+7.2+1.2-0.12
=6.7+7.2+1.2-0.12
=15.1-0.12
=14.98
我尽力了😇
=78.7-(18-0.3)×(4-0.4)
=78.7-(18×4-18×0.4-0.3×4+0.3×0.4)
=78.7-(72-7.2-1.2+0.12)
=78.7-72+7.2+1.2-0.12
=6.7+7.2+1.2-0.12
=15.1-0.12
=14.98
我尽力了😇
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