①45×8-240÷15②(2.5-2.5×0.6)÷0.4③41.2-9.5×1.8÷0.45④(14+19-112)×72⑤815÷16-715×6⑥710÷[(35-14)×12].-数学
题文
①45×8-240÷15 ②(2.5-2.5×0.6)÷0.4 ③41.2-9.5×1.8÷0.45 ④(
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答案
①45×8-240÷15, =360-16, =344; ②(2.5-2.5×0.6)÷0.4, =(2.5-1.5)÷0.4 =1÷0.4, =2.5; ③41.2-9.5×1.8÷0.45, =41.2-17.1÷0.45, =41.2-38, =3.2; ④(
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=18+8-6, =26-6, =20; ⑤
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=(
=1×6, =6; ⑥
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