Question

怎样简便就怎样计算． 7.26×1.4+12.74×1.4	1.25×2.5×32
6.8×10.2	14.9×2.17-4.9×2.17
8.8×0.125	36×9.9．

Answer 1

（1）7.26×1.4+12.74×1.4
=（7.26+2.74）×1.4
=10×1.4
=14；

（2）1.25×2.5×32
=1.25×2.5×8×4
=（1.25×8）×（2.5×4）
=10×10
=100；

（3）6.8×10.2
=6.8×（10+0.2）
=68+1.36
=69.36；

（4）14.9×2.17-4.9×2.17
=（14.9-4.9）×2.17
=10×2.17
=21.7；

（5）8.8×0.125
=（8+0.8）×0.125
=8×0.125+0.8×0.125
=1+0.1
=1.1；

（6）36×9.9
=36×（10-0.1）
=36×10-36×0.1
=360-3.6
=356.4．