1.76乘十二点目录
0.48×2.5×12.5
=(0.6×2.5)×(12.5×0.8)
=1.5×10
=15
19.4×2.5 7.5×19.4
=19.4×(2.5 7.5)
=19.4×10
=194
2.44÷(2.7-2.09)×6.5
=2.44÷0.61×6.5
=4×6.5
=26
解:原式=0.25x12.5x(4x4)
=(0.25x4)x(12.5x4)
=1x50
=50
分析:主要考察拆分法和结合律的运用。
1.76乘十二点目录
0.48×2.5×12.5
=(0.6×2.5)×(12.5×0.8)
=1.5×10
=15
19.4×2.5 7.5×19.4
=19.4×(2.5 7.5)
=19.4×10
=194
2.44÷(2.7-2.09)×6.5
=2.44÷0.61×6.5
=4×6.5
=26
解:原式=0.25x12.5x(4x4)
=(0.25x4)x(12.5x4)
=1x50
=50
分析:主要考察拆分法和结合律的运用。
◎欢迎参与讨论,请在这里发表您的看法、交流您的观点。