脱式计算，能简算的要简算．70.8﹣7.25﹣1.75 5.81+8.3+4.19+11.70.05×0.4×20×1.7 4.87×2.34+4.87×7.66．
直接写出得数．+=﹣=×2=×= 54﹣54×0=×=÷4=÷=÷42= 0÷25+2.5=×=×14=÷4=+÷+=
直接写出得数． 3﹣2= 1÷= 321﹣178+257= 0.875÷= 409×10﹣409= 2.25+7= （+）×18= 3+2.7+2+1.3=
口算、心算我最强+× 8.4÷0.7 470﹣72﹣28 5÷﹣+÷+×××25% 698﹣299．
直接写出得数． 28+43= 4﹣1.5= 2.5×4= 23.4÷10= 1.5+6﹣1.5= 1﹣=﹣= 4.8÷12=÷= 3.9×5×=
直接写得数． 1﹣+1﹣=﹣= 2.25×4= 0.67+0.33=÷=×80%=（+）×12= 45%÷15%=
+
=
﹣
=
×2=
×
= 54﹣54×0=
×
=
÷4=
=
÷42= 0÷25+2.5=
×
=
×14=
÷4=
+
+
= 1÷
= 321﹣178+257=
= 409×10﹣409= 2.25+7
+
+2.7+2
+1.3=
+
×
8.4÷0.7 470﹣72﹣28 5÷
+
×
×
×25% 698﹣299．
=
﹣
= 4.8÷12=
= 3.9×5×
+1﹣
﹣
= 2.25×4= 0.67+0.33=
÷
=
×80%=（
）×12= 45%÷15%=
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