40*【【760+130】*4】简便运算
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40*【【760+130】*4】简便运算
40x(760+130)x4
=80x890
=80x(900-10)
=80x900-80x10
=72000-800
=71200
40*【【760+130】*4】简便运算
40x(760+130)x4
=80x890
=80x(900-10)
=80x900-80x10
=72000-800
=71200