巧算:66×45+22×65

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巧算:66×45+22×65巧算:66×45+22×65巧算:66×45+22×6566×45+22×65=3*22*45+22*65=22*(3*45+65)=22*200=440066×45+22

巧算:66×45+22×65
巧算:66×45+22×65

巧算:66×45+22×65
66×45+22×65
=3*22*45+22*65
=22*(3*45+65)
=22*200
=4400

66×45+22×65
=3*22*45+22*65
=22*(3*45+65)
=22*200
=4400

11*6*5*9+11*2*13*5=55*54+55*26=55*80=4400

66×45+22×(45+20)=66×45+22×45+22×20=(22+66)×45+440=88×45+440=88×(40+5)+440=3520+440+440=4400

66x(45+65)-22

66*45+22*65=6*11*5*9+2*11*5*13=2*11*5*(27+13)=110*40=4400