脱式计算,能简算的要简算 2.78*4.9+0.49*72.2 ,
问题描述:
脱式计算,能简算的要简算 2.78*4.9+0.49*72.2 ,
答
2.78*4.9+0.49*72.2
=2.78x4.9+0.49x72.2
=27.8x0.49+0.49x72.2
=(27.8+72.2)x0.49
=100x0.49
=49
希望对你有帮助。
答
2.78×4.9+0.49×72.2
=2.78×4.9+4.9×7.22
=4.9×(2.78+7.22)
=4.9×10
=49
答
2.78*4.9+0.49*72.2
=2.78*4.9+4.9*7.22
=4.9*(2.78+7.22)
=4.9*10
=49