试题 试卷
题型:计算题 题类:常考题 难易度:普通
①20.15+20.15×99
②1+3+5+7+…+33+35+37+39.
4+8+16=16×2﹣4=28
4+8+16+32=32×2﹣4=60
4+8+16+32+64=64×2﹣4=124
4+8+16+32+…+256={#blank#}1{#/blank#}
a+2a+4a+8a+16a+…+1024a={#blank#}2{#/blank#}
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{#blank#}6{#/blank#} {#blank#}7{#/blank#} {#blank#}8{#/blank#} {#blank#}9{#/blank#} {#blank#}10{#/blank#}
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