17x12.5x1.4怎样简算小学数学七彩课堂五年级上册
\u5c0f\u5b66\u4e94\u5e74\u7ea7\u4e0a\u518c\u6570\u5b66\u8bfe\u5802\u7b2c50\u9875\u7b2c\u56db\u9898\u7684\u7b54\u6848\uff08\u6700\u597d\u4e24\u4e2a\u90fd\u7b97\uff0c\u4e00\u5b9a\u8981\u628a\u8fc7\u7a0b\u5199\u51fa\u6765\uff01\uff09\u82b1\u7532\uff1a\uff08141-7\u00d73\uff09\u00f72
\uff1d120\u00f72
\uff1d60\u5c81
\u53e4\u7a00\uff1a\uff08141-1\uff09\u00f72
\uff1d140\u00f72
\uff1d70\u5c81
\uff0820\u51cf3\u4e582\u5206\u4e4b\u4e94\uff09\u96644
17*12.5*1.4=17*12.5*（0.8+0.6）
=17*12.5*0.8+7*12.5*0.6
=170+525
=695
可以把12.5拆成2.5乘以5
然后17乘以2.5乘以1.4乘以5
等于（16+1）乘以2.5乘以7
等于（40+2.5）乘以7
把12.5分成2.5X5 然后就是（17X5）X（2.5X1.4）
先算12.5x1.4
绛旓細12.5脳1.6脳1.5 =12.5x8x0.2x1.5 =10x锛0.2x1.5锛=10x0.3 =3
绛旓細1.6*12.5 =12.5*8*0.2 =100*0.2 =20 甯屾湜鑳藉府鍒颁綘
绛旓細=0.8x8x0.125x12.5 =0.8x12.5x(8x0.125)=10x1 =10
绛旓細10.4x12.5 锛濓紙10+0.4锛x12.5 =10x12.5+0.4x12.5 =125+5 =130 甯屾湜鑳藉府鍒颁綘
绛旓細=25脳0.2脳8脳12.5 =(25*0.2)*(8*12.5)=5*100 =500
绛旓細9x-2.7=1.8 9x=1.8+2.7 9x=4.5 x=0.5 6x+0.2*7=25.4 6x+1.4=25.4 6x=24 x=4 3x+2x=12.5 5x=12.5 x=2.5 48-5x=20.5 5x=48-20.5 5x=27.5 x=5.5 绠绠 7.6+7.6*7.6+1.4*7.6 =7.6*(1+7.6+1.4)=7.6*10 =76 0.09+0.6+5.91+3.4 =(...
绛旓細1.25x2.7+12.5x0.32+0.125x41 =1.25x2.7+1.25x3.2+1.25x4.1 =1.25x(2.7+3.2+4.1)=1.25x(5.9+4.1)=1.25x10 =12.5
绛旓細绠绠锛氾紙1锛2.5脳32脳0.125 =锛2.5脳4锛壝楋紙8脳0.125锛=10脳1 =10 锛2锛3.5-7+6.5 =3.5+6.5-7 =3 锛3锛1.2脳2.5+0.8脳2.5 =2.5(1.2+0.8)=25 锛4锛8.9脳1.25-0.9脳1.25 =1.25脳(8.9-0.9)=10 锛5锛12.5脳7.4脳0.8 =12.5脳0.8脳7.4 =...
绛旓細12.5脳16脳0.5 =12.5脳锛16脳0.5锛=12.5脳8 =100
绛旓細浜斿勾绾т笂鍐屾暟瀛绠渚胯绠30閬撻鍙婄瓟妗1銆24.6-3.98+5.4-6.02 瑙ｆ瀽:姝ら鍒╃敤鍔犳硶浜ゆ崲缁撳悎寰,鍑戞暣鍐嶈绠椼傛楠ゅ涓: 24.6-3.98+5.4-6.02 =(24.6+5.4)-(3.98+6.02) =30-10 =20 2銆27脳17/26 瑙ｆ瀽:姝ら鍏堢敤鍔犳硶鍒嗛厤寰,鎶27杞崲鎴(26+1),鍐嶅埄鐢ㄤ箻娉曠粨鍚堝緥,浣垮緱杩愮畻绠渚裤 27脳17/26 =(26+1)脳17/26...
