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题型:单选题 题类:常考题 难易度:普通
用2--5的乘法口诀求商1742 10
26+14=
28+19+52={#blank#}1{#/blank#}
69+13={#blank#}1{#/blank#}
29+36={#blank#}2{#/blank#}
20+7 = 30-20 = 90+9= 60-30 = 24+6 =
51+8= 7+83= 85-5 = 90-70= 45+20=
96-7 = 65+20= 39+8= 4+65=
18+50-7= 80-60+35= 90-(60+30)= 63-(76-70)=
52+35= 86-34= 47+33= 70-26= 40+60=
23+69 = 36+20= 65-15= 62-18= 37- 28=
60-20= 26+60= 32-10= 87-8=
30+50= 77-17= 30+60= 62+9=
78-8= 86-80= 52+10= 45+50=
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