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5.28+0.63+3.27的简便方法咋个算

5.28+0.63+3.27 =5.28+(0.63+3.27) =5.28+3.9 =9.18

我想到2种, 1是高斯定理, 2+28=30 4+26=30 前面一共是15个30=450 1+29=30 3+37=30 后面一共是14个30+15=435 减下来剩15 2是(2-1)+(4-3)+(6-5).....+(30-29)一共15项 1x15=15

30-29+…+4-3+2-1 =(30-29)×30÷2 =15

(1)5400-2940÷28×27=5400-105×27,=5400-2835,=2565;(2)27.98+0.5×0.3-18÷1.5=27.98+0.15-18÷1.5,=27.98+0.15-12,=28.13-12,=16.13;(3)( 4 5 + 1 4 )÷ 7 3 + 7 10 = 21 20 × 3 7 + 7 10 ,= 9 20 + 7 10 ,= 23 20 ;(4) 47 73...

先算1.28*0.5=0.64,再算3.27+0.64=3.91

(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,=10...

int sum(int a,b)}int s=0;for(i=a;i

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