用简便方法计算: 102×43 &...

用简便方法计算: 102×43 16×57+43×16 7.8+5.26+3.74+2.2 67×8×125 250×17×4×2 (125+1250)×8.

①102×43
=100×43+2×43
=4300+86
=4386;

②16×57+43×16
=16×(57+54)
=16×100
=1600;

③7.8+5.26+3.74+2.2
=(7.8+2.2)+(5.26+3.74)
=10+9
=19;

④67×8×125
=67×(8×125)
=67×1000
=67000;
⑤250×17×4×2
=(250×4)×(17×2)
=1000×34
=34000;

⑥(125+1250)×8
=125×8+1250×8
=1000+10000
=11000.
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