66x21十19x21十85x19=?求简算!

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66x21十19x21十85x19=?求简算!
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66x21十19x21十85x19=?求简算!
66x21十19x21十85x19=?求简算!

66x21十19x21十85x19=?求简算!

=21(66+19)+85X19
=85X21+85X19
=85(21+19)
=85X40
=3400

(66+19+85)×21—85×2

=(66+19)✘21+85✘19
=85✘21+85✘19
=(21+19)✘85
=40✘85
=3400