4.2x7.8+2.2x42怎样简算

4.2x7.8+2.2x42怎样简算
2025-05-01 01:12:33
推荐回答(3个)
回答1:

4.2x7.8+2.2x42
=4.2x7.8+2.2x4.2×10
=4.2x7.8+4.2×22
=4.2×(7.8+22)
=4.2×29.8
=4.2×(30-0.2)
=4.2×30-4.2×0.2
=126-0.84
=125.16

回答2:


回答3:

4.2×7.8+2.2×42
=4.2×7.8+4.2×22
=4.2×(7.8+22)
=4.2×29.8
=4.2×(30-0.2)
=4.2×30-4.2×0.2
=126-0.74
=125.26