请运用简便方法计算．
（1）5.7×1.4+1.4×4.3 （2）9.05﹣3.86﹣3.14 （3）6.84×10.1
（4）87×2.5+8.7×75 （5）1+2+3+4+5+6+…+97+98+99 （6）0.7777×0.7+0.1111×5.1．
相关试题
请运用简便方法计算．
（1）5.7×1.4+1.4×4.3 （2）9.05﹣3.86﹣3.14 （3）6.84×10.1
（4）87×2.5+8.7×75 （5）1+2+3+4+5+6+…+97+98+99 （6）0.7777×0.7+0.1111×5.1．
×10=
+
= 52×
=
=
÷
= 11﹣
=
×
=
﹣
+
= 1÷9×
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
×
×
= 16×
=
÷
= 1÷
=
÷
= 9÷
=
÷33= 1﹣25%= 75%+0.25=
÷
=
﹣
=
=
= 1÷10%= 74×4×25%=
×15%=
×24=
÷
= 25×
×
= 5.8×9+5.8=
+
= 5÷5÷
=
÷
÷
×
= 1÷2.5%=
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