
简便计算6.9×3.1+3.1×3.1,5.2-1.28-0.72,4X2.5÷0.08,3.5×1.2-4.12,5.8+2.4×0.15。
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问:
便计算6.9×3.1+3.1×3.1,5.2-1.28-0.72,4X2.5÷0.08,3.5×1.2-4.12,5.8+2.4×0.15。
答:
6.9×3.1+3.1×3.1
=3.1×(6.9+3.1)
=3.1×10
=31
5.2-1.28-0.72
=3.92-0.72
=3.2
4X2.5÷0.08
=10÷0.08
=125
3.5×1.2-4.12
=4.2-4.12
=0.08
5.8+2.4×0.15
=5.8+0.36
=6.16
答题完毕,谢谢采纳
便计算6.9×3.1+3.1×3.1,5.2-1.28-0.72,4X2.5÷0.08,3.5×1.2-4.12,5.8+2.4×0.15。
答:
6.9×3.1+3.1×3.1
=3.1×(6.9+3.1)
=3.1×10
=31
5.2-1.28-0.72
=3.92-0.72
=3.2
4X2.5÷0.08
=10÷0.08
=125
3.5×1.2-4.12
=4.2-4.12
=0.08
5.8+2.4×0.15
=5.8+0.36
=6.16
答题完毕,谢谢采纳
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