6.7乘9加9.9乘3(简便)

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6.7乘9加9.9乘3(简便)6.7乘9加9.9乘3(简便)6.7乘9加9.9乘3(简便)6.7*9+9.9*3=6.7*9+3.3*9=(6.7+3.3)*9=10*9=906.7*9+9.9*3=

6.7乘9加9.9乘3(简便)
6.7乘9加9.9乘3(简便)

6.7乘9加9.9乘3(简便)
6.7*9+9.9*3
=6.7*9+3.3*9
=(6.7+3.3)*9
=10*9
=90

6.7*9+9.9*3=6.7*(10-1)+(10.0.1)*3=6.7*10-6.7+3*10-0.1*3
=60.3+29.7=90