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简便计算.1.5×102= 0.25×32×1.25= 0.36×0.99+0.36×0.01= 2.5×7.2=

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/25 18:58:18
简便计算.
1.5×102=
0.25×32×1.25=
0.36×0.99+0.36×0.01= 2.5×7.2=
①1.5×102
=1.5×100+1.5×2
=150+3
=153;
②0.25×32×1.25
=(0.25×4)×(8×1.25)
=1×10
=10;
③0.36×0.99+0.36×0.01
=0.36×(0.99+0.01)
=0.36×1
=0.36;
④2.5×7.2
=(2.5×4)×1.8
=10×1.8
=18.