2.8×7.5+2.8×2.6-28巧算
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
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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
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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