35X28+70用简便算法怎么算

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35X28+70用简便算法怎么算35X28+70用简便算法怎么算35X28+70用简便算法怎么算35X28+70=35X28+35X2=35X(28+2)=35X30=105035X28+70=35X

35X28+70用简便算法怎么算
35X28+70用简便算法怎么算

35X28+70用简便算法怎么算
35X28+70
=35X28+35X2
=35X(28+2)
=35X30
=1050

35X28+70
=35X28+35X2
=35X(28+2)
=35X30
=1050

=5X7X4X7+70
=4X5X7X7+70
=20X49+70
=980+70
=1050

35X28+70
=35X28+35×2
=35×(28+2)
=35×30
=1050