Question

2.8×7.5+2.8×2.6-28巧算

Answer 1

2.8×7.5+2.8×2.6-28巧算

2.8×7.5+2.8×2.6-28
解：巧算
=2.8x7.5+2.8x2.6-2.8x10
=2.8x(7.5+2.6-10)
=2.8x0.1
=0.28
祝学习进步。

2.8乘7.5怎么巧算

2.8X7.5
=(3-0.2)X7.5
=3X7.5-0.2X7.5
=22.5-1.5
=21

2-8x7.5+2.8x2.6-28条算。

2.8x7.5+2.8x2.6-28
=2.8x(7.5+2.6-10)
=2.8x0.1
=0.28

4.56*2.8-0.28+0.554*28怎么巧算

4.56*2.8-0.28+0.554*28
=4.56*2.8-0.1*2.8+5.54*2.8
=（4.56-0.1+5.54)*2.8
=10*2.8
=28

2.8*5.6/3.4*2.8/2.8巧算

2.8*5.6/3.4*2.8/2.8
=2.8*5.6÷3.4*2.8÷2.8
=（2.8*5.6*2.8）÷（3.4*3.8）
=（2.8*5.6）÷3.4
=15.68/3.4
=1568/340
=784/170
=392/85
=85分之392
=4又85分之52
朋友,请及时采纳正确答案,下次还可能帮您,您采纳正确答案,您也可以得到财富值,谢谢。

0.19×2.8 0.91×2.8-0.28巧算

=2.8×0.19+2.8×0.91-2.8×0.1
=2.8×（2.8+8.2-0.1）
=2.8×10
=28

45×2.8÷1.4巧算

45×2.8÷1.4
=45×（2.8÷1.4）
=45×2
=9

5.8*2.8 6.3*2.8-0.28怎么巧算

5.8x2.8+6.3x2.8-0.28
=2.8x（5.8+6.3-0.1）
=2.8x（5.8+4.2+2+0.1-0.1）
=2.8x（10+2）
=2.8x10+2.8x2
=28+5.6
=33.6
谢谢，请采纳

巧算：（3.14+2.8+1）×(3.14+2.8+0.2)-(1+3.14+2.8+0.2)×(3.14+2.8)

您好：
设：3.14+2.8=A
原式=（A+1）X(A+0.2)-(A+1.2)XA
=AxA+1.2A+0.2-AXA-1.2A
=0.2
如果本题有什么不明白可以追问，如果满意请点选“采纳为满意回答”
如果有其他问题请采纳本题后另发点击向我求助，答题不易，请谅解，谢谢。
祝学习进步！

2.8-0.99x2.8怎么巧算

2.8-0.99x2.8
=2.8×（1-0.99）
=2.8×0.01
=0.028