用合理的方法计算 765×213÷27+765×327÷27 (2÷3+3÷7+5÷21)÷1/21÷0.28.
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(1)765×213÷27+765×327÷27
=(213+327)×765÷27,
=540×765÷27,
=540÷27×765,
=20×765,
=15300;
(2)(2÷3+3÷7+5÷21)× 1 21 ÷0.28
=( 2 3 + 3 7 + 5 21 )×21÷0.28,
=( 2 3 ×21+ 3 7 ×21+ 5 21 ×21)÷0.28,
=(14+9+5)÷0.28,
=28÷0.28,
=100.
=(213+327)×765÷27,
=540×765÷27,
=540÷27×765,
=20×765,
=15300;
(2)(2÷3+3÷7+5÷21)× 1 21 ÷0.28
=( 2 3 + 3 7 + 5 21 )×21÷0.28,
=( 2 3 ×21+ 3 7 ×21+ 5 21 ×21)÷0.28,
=(14+9+5)÷0.28,
=28÷0.28,
=100.
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