4.8×0.25
=1.2×4×0.25
=1.2×(4×0.25)
=1.2×1
=1.2
4.8x0.25
=(4+0.8)x0.25
=4x0.25+0.8x0.25
=1+0.2
=1.2
您好:
4.8X0.25
=4x1.2x0.25
=(4x0.25)x1.2
=1x1.2
=1.2
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4.8×0.25
=4×0.25+0.8×0.25
=1+0.2
=1.2
=0.78x(100一2)
=0,78x100一0.78x2
=78一1.56
=76.44
①0.25×0.975×40
=0.25×40×0.975
=10×0.975
=9.75;
②0.89×4.8+0.89×5.2
=0.89×(4.8+5.2)
=0.89×10
=8.9;
③(8+0.8)×1.25
=8×1.25+0.8×1.25
=10+1
=11;
④10-0.38-0.62
=10-(0.38+0.62)
=10-1
=9;
⑤45.3×101-45.3
=45.3×(101-1)
=45.3×100
=4530;
⑥1.25×0.25×8×0.4
=(1.25×8)×(0.25×0.4)
=10×0.1
=1.
计算:
820x1.03
=820x(1+0.03)
=820+24.6
=844.6
4.8X0.25
=1.2x4x0.25
=1.2x1
=1.2