54减去某数的4倍等于6，求某数．
直接写出得数÷3=×15= 2﹣=÷= 5÷=
直接写出得数= 1÷=÷60%=×15== 6.8÷10%= 4.5+== 2﹣==
计算 75××13×××÷××÷×÷÷÷÷÷21．
×=÷6=÷= 1÷=×=﹣=+= 6÷= 0÷=×===
直接写出得数． 18×=÷= 0.25×3.2×4= 32×（1﹣0.99）= 25%×4= 0÷=÷=×÷×=
÷3=
×15= 2﹣
=
÷
= 5÷
=
= 1÷
=
÷60%=
×15=
=
= 2﹣
=
=
×13
×
×
×
÷
×
×
÷
×
÷
÷
÷
÷
÷21．
×
=
÷6=
÷
= 1÷
×
=
﹣
=
+
= 6÷
=
=
=
=
=
=
÷
= 0.25×3.2×4= 32×（1﹣0.99）=
÷
×
÷
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