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4.2x7.8+2.2x4.2简便计算

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

题目应为:3.5×7.8+2.2×3.5,否则不能进行简便计算, 3.5×7.8+2.2×3.5 =3.5×(7.8+2.2) =3.5×10 =35

这个题 等于 4.2x(7.8+2.2) 等于 4.2x10 等于 42

0.87x(3.36+4.64)

7.8+2.2x0.92 =10-2.2+2.2x0.92 =10-2.2x(1-0.92) =10-2.2x0.08 =10-0.176 =9.824 朋友,请及时采纳正确答案,下次还可能帮到您哦,您采纳正确答案,您也可以得到财富值,谢谢。

7.8x0.6+2.2简便计算 =4.68+2.2 =6.88 不能简便

你先回答我的问题,你是男是女

7.8+2.2×7.8=7.8×(2.2+1)=7.8×3.2=7.8×4×0.8=24.96

2.2x0.22+7.8x2.2-4.4 =2.2x(0.22+7.8-2) =2.2x6.02 =2.2x6+2.2x0.02 =13.2+0.044 =13.244 打字很辛苦,望采纳,您的采纳是我回答问题的动力哦!

(首项+末项)×项数÷2=和,所以,(1+10)×10÷2=55

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