精準(zhǔn)學(xué)與練三年級數(shù)學(xué)人教版
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混合運算專項訓(xùn)練（2）
$38 - 18÷2$ $44 + 6×3$ $64 - 15 + 28$ $72÷(43 - 35)$ $37 + 4×9$ $73 - (36 + 18)$ $90 - 36÷6$ $32 - 28 + 18$ $32÷8×7$ $81÷(54 - 45)$ $(88 - 16)÷9$ $9×9 - 47$ $8×5 + 26$ $56÷8 + 9$ $81÷9×6$ $7×(6 + 2)$ $24÷(2×3)$ $(18 + 10)÷7$ $73 - 37 - 20$ $48 - 24÷6$ $54÷(32 - 26)$
答案：$38 - 18÷2 = 38 - 9 = 29$
$44 + 6×3 = 44 + 18 = 62$
$64 - 15 + 28 = 49 + 28 = 77$
$72÷(43 - 35) = 72÷8 = 9$
$37 + 4×9 = 37 + 36 = 73$
$73 - (36 + 18) = 73 - 54 = 19$
$90 - 36÷6 = 90 - 6 = 84$
$32 - 28 + 18 = 4 + 18 = 22$
$32÷8×7 = 4×7 = 28$
$81÷(54 - 45) = 81÷9 = 9$
$(88 - 16)÷9 = 72÷9 = 8$
$9×9 - 47 = 81 - 47 = 34$
$8×5 + 26 = 40 + 26 = 66$
$56÷8 + 9 = 7 + 9 = 16$
$81÷9×6 = 9×6 = 54$
$7×(6 + 2) = 7×8 = 56$
$24÷(2×3) = 24÷6 = 4$
$(18 + 10)÷7 = 28÷7 = 4$
$73 - 37 - 20 = 36 - 20 = 16$
$48 - 24÷6 = 48 - 4 = 44$
$54÷(32 - 26) = 54÷6 = 9$
解析：均按混合運算順序計算，有括號先算括號內(nèi)，先乘除后加減，同級從左到右。
