简算：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149（要过程）题是：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149

简算：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149（要过程）题是：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149
简算：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149（要过程）
题是：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149

简算：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149（要过程）题是：7/31×156 5/23×163 8/19×154 11/43×130 8/29×151 8/29×149

7/31x156=7/31x(155+1)=7/31x155+7/31=7x5+7/31=35+7/31
5/23x163=5/23x(161+2)=5/23X161+2x5/23=5x7+10/23=35+10/23
8/19x154=8/19(152+2)=8/19x152+2x8/19=8x7+16/19=56+16/19
11/43x130=11/43x(129+1...

全部展开

7/31x156=7/31x(155+1)=7/31x155+7/31=7x5+7/31=35+7/31
5/23x163=5/23x(161+2)=5/23X161+2x5/23=5x7+10/23=35+10/23
8/19x154=8/19(152+2)=8/19x152+2x8/19=8x7+16/19=56+16/19
11/43x130=11/43x(129+1)=11/43x129+11/43=11x3+11/43=33+11/43
8/29x151=8/29x(145+6)=8/29x145+6x8/29=8x5+48/29=40+1+19/29=41+19/29
8/29x149=8/29x(145+4)=8/29x145+4x8/29=40+1+3/29=41+3/29

收起

7/31×156=1092/31
5/23×163=815/23
8/19×154=1232/19
11/43×130 =1430/43
8/29×151= 1208/29
8/29×149=1192/29