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4.2x7.8+2.2x4.2脱式计算简便算法.

呃呃。。。

你先回答我的问题,你是男是女

7.8-7.5+2.2-2.5=(7.8+2.2)-(7.5+2.5)=10-10=0

0.87x(3.36+4.64)

解:原式=1.25×0.8×0.32 =1×0.32 =0.32 望采纳

125x(64x2) =125x8x8x2 =1000x16 =16000

48*25=12*4*25=12*100=1200

9.83x(3.8-2.3)+ 1.5x6.17 =9.83×1.5+1.5×6.17 =1.5×(9.83+6.17) =1.5×16 =1.5×2×8 =3×8 =24

8.2-9.6x0.5 =8.2-4.8 =3.4

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